[Spaces] Open 'manage roles' link for spaces assign role flyout in ne…

…w tab (elastic#199506)

## Summary

Closes elastic/kibana-team#1281

Modify the "manage role" link in the assign roles to space tab, so it
opens the roles screen in a new tab, with an improvement so that on
transitioning back to the assign roles space tab the user is presented
with an updated list of roles created in the page that was created
opened, if any.

Caveat:

This approach will continually make calls to refresh the role list on
every page visibility event that matches the conditions provided until
the flyout gets closed.

##### Visuals


https://github.com/user-attachments/assets/64cb296d-246d-4033-a655-7b10d0dafab1


### Checklist

Delete any items that are not applicable to this PR.

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- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials -->
- [x] [Unit or functional
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were updated or added to match the most common scenarios
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### Risk Matrix

Delete this section if it is not applicable to this PR.

Before closing this PR, invite QA, stakeholders, and other developers to
identify risks that should be tested prior to the change/feature
release.

When forming the risk matrix, consider some of the following examples
and how they may potentially impact the change:

| Risk | Probability | Severity | Mitigation/Notes |

|---------------------------|-------------|----------|-------------------------|
| Multiple Spaces&mdash;unexpected behavior in non-default Kibana Space.
| Low | High | Integration tests will verify that all features are still
supported in non-default Kibana Space and when user switches between
spaces. |
| Multiple nodes&mdash;Elasticsearch polling might have race conditions
when multiple Kibana nodes are polling for the same tasks. | High | Low
| Tasks are idempotent, so executing them multiple times will not result
in logical error, but will degrade performance. To test for this case we
add plenty of unit tests around this logic and document manual testing
procedure. |
| Code should gracefully handle cases when feature X or plugin Y are
disabled. | Medium | High | Unit tests will verify that any feature flag
or plugin combination still results in our service operational. |
| [See more potential risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx) |


### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
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- [ ] This will appear in the **Release Notes** and follow the
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x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.test.tsx

@@ -6,7 +6,7 @@
  */
 
 import { EuiThemeProvider } from '@elastic/eui';
-import { render, screen, waitFor, within } from '@testing-library/react';
+import { fireEvent, render, screen, waitFor, within } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import crypto from 'crypto';
 import React from 'react';
@@ -142,6 +142,15 @@ describe('PrivilegesRolesForm', () => {
     jest.clearAllMocks();
   });
 
+  it("would open the 'manage roles' link in a new tab", () => {
+    getRolesSpy.mockResolvedValue([]);
+    getAllKibanaPrivilegeSpy.mockResolvedValue(createRawKibanaPrivileges(kibanaFeatures));
+
+    renderPrivilegeRolesForm();
+
+    expect(screen.getByText('Manage roles')).toHaveAttribute('target', '_blank');
+  });
+
   it('does not display the privilege selection buttons or customization form when no role is selected', async () => {
     getRolesSpy.mockResolvedValue([]);
     getAllKibanaPrivilegeSpy.mockResolvedValue(createRawKibanaPrivileges(kibanaFeatures));
@@ -170,6 +179,23 @@ describe('PrivilegesRolesForm', () => {
     expect(screen.getByTestId('space-assign-role-create-roles-privilege-button')).toBeDisabled();
   });
 
+  it('makes a request to refetch available roles if page transitions back from a user interaction page visibility change', () => {
+    getRolesSpy.mockResolvedValue([]);
+    getAllKibanaPrivilegeSpy.mockResolvedValue(createRawKibanaPrivileges(kibanaFeatures));
+
+    renderPrivilegeRolesForm();
+
+    expect(getRolesSpy).toHaveBeenCalledTimes(1);
+
+    // trigger click on manage roles link, which is perquisite for page visibility handler to trigger role refetch
+    fireEvent.click(screen.getByText(/manage roles/i));
+
+    // trigger page visibility change
+    fireEvent(document, new Event('visibilitychange'));
+
+    expect(getRolesSpy).toHaveBeenCalledTimes(2);
+  });
+
   it('renders with the assign roles button disabled when no base privileges or feature privileges are selected', async () => {
     getRolesSpy.mockResolvedValue([]);
     getAllKibanaPrivilegeSpy.mockResolvedValue(createRawKibanaPrivileges(kibanaFeatures));

x-pack/plugins/spaces/public/management/edit_space/roles/component/space_assign_role_privilege_form.tsx

@@ -23,6 +23,7 @@ import {
   EuiSpacer,
   EuiText,
   EuiTitle,
+  useGeneratedHtmlId,
 } from '@elastic/eui';
 import type { EuiComboBoxOptionOption } from '@elastic/eui';
 import type { FC } from 'react';
@@ -81,10 +82,13 @@ export const PrivilegesRolesForm: FC<PrivilegesRolesFormProps> = (props) => {
   const [selectedRoles, setSelectedRoles] = useState<ReturnType<typeof createRolesComboBoxOptions>>(
     createRolesComboBoxOptions(defaultSelected)
   );
+  const manageRoleLinkId = useGeneratedHtmlId();
   const isEditOperation = useRef(Boolean(defaultSelected.length));
 
-  useEffect(() => {
-    async function fetchRequiredData(spaceId: string) {
+  const userInvokedPageVisibilityChange = useRef<boolean | null>(null);
+
+  const fetchRequiredData = useCallback(
+    async (spaceId: string) => {
       setFetchingDataDeps(true);
 
       const [systemRoles, _kibanaPrivileges] = await invokeClient((clients) =>
@@ -109,10 +113,28 @@ export const PrivilegesRolesForm: FC<PrivilegesRolesFormProps> = (props) => {
       );
 
       setKibanaPrivileges(_kibanaPrivileges);
-    }
+    },
+    [invokeClient]
+  );
 
+  useEffect(() => {
     fetchRequiredData(space.id!).finally(() => setFetchingDataDeps(false));
-  }, [invokeClient, space.id]);
+  }, [fetchRequiredData, invokeClient, space.id]);
+
+  useEffect(() => {
+    async function visibilityChangeHandler() {
+      // page just transitioned back to visible state from hidden state caused by user interaction
+      if (userInvokedPageVisibilityChange.current && !document.hidden) {
+        await fetchRequiredData(space.id!).finally(() => setFetchingDataDeps(false));
+      }
+    }
+
+    document.addEventListener('visibilitychange', visibilityChangeHandler);
+
+    return () => {
+      document.removeEventListener('visibilitychange', visibilityChangeHandler);
+    };
+  }, [fetchRequiredData, invokeClient, space.id]);
 
   const selectedRolesCombinedPrivileges = useMemo(() => {
     const combinedPrivilege = new Set(
@@ -345,12 +367,23 @@ export const PrivilegesRolesForm: FC<PrivilegesRolesFormProps> = (props) => {
         <React.Fragment>
           {!isEditOperation.current && (
             <EuiFormRow
+              onClick={(event: React.MouseEvent<HTMLFieldSetElement>) => {
+                // leverage event propagation, check if manage role link element was clicked
+                if ((event.target as HTMLFieldSetElement).id === manageRoleLinkId) {
+                  userInvokedPageVisibilityChange.current = true;
+                }
+              }}
               label={i18n.translate(
                 'xpack.spaces.management.spaceDetails.roles.selectRolesFormRowLabel',
                 { defaultMessage: 'Select roles' }
               )}
               labelAppend={
-                <EuiLink href={getUrlForApp('management', { deepLinkId: 'roles' })}>
+                <EuiLink
+                  id={manageRoleLinkId}
+                  href={getUrlForApp('management', { deepLinkId: 'roles' })}
+                  external={false}
+                  target="_blank"
+                >
                   {i18n.translate(
                     'xpack.spaces.management.spaceDetails.roles.selectRolesFormRowLabelAnchor',
                     { defaultMessage: 'Manage roles' }