[Cloud] Add configuration for CSP value (elastic#190491)

## Summary

Exposes the CSP from the cloud setup plugin contract.

Related elastic#190023

## Notes

Intended for cloud deployments, how/where will this config value be set?


### Checklist

Delete any items that are not applicable to this PR.

- [x]
[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
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

test/plugin_functional/test_suites/core_plugins/rendering.ts

@@ -229,6 +229,7 @@ export default function ({ getService }: PluginFunctionalProviderContext) {
         'xpack.ccr.ui.enabled (boolean?)',
         'xpack.cloud.base_url (string?)',
         'xpack.cloud.cname (string?)',
+        'xpack.cloud.csp (string?)',
         'xpack.cloud.deployment_url (string?)',
         'xpack.cloud.deployments_url (string?)',
         'xpack.cloud.is_elastic_staff_owned (boolean?)',

x-pack/plugins/cloud/public/plugin.test.ts

@@ -31,6 +31,7 @@ describe('Cloud Plugin', () => {
           ...baseConfig,
           id: 'cloudId',
           cname: 'cloud.elastic.co',
+          csp: 'aws',
           ...configParts,
         });
         const plugin = new CloudPlugin(initContext);
@@ -86,6 +87,11 @@ describe('Cloud Plugin', () => {
         expect(setup.cname).toBe('cloud.elastic.co');
       });
 
+      it('exposes csp', () => {
+        const { setup } = setupPlugin();
+        expect(setup.csp).toBe('aws');
+      });
+
       it('exposes registerCloudService', () => {
         const { setup } = setupPlugin();
         expect(setup.registerCloudService).toBeDefined();

x-pack/plugins/cloud/public/plugin.tsx

@@ -23,6 +23,7 @@ export interface CloudConfigType {
   id?: string;
   organization_id?: string;
   cname?: string;
+  csp?: string;
   base_url?: string;
   profile_url?: string;
   deployments_url?: string;
@@ -82,6 +83,7 @@ export class CloudPlugin implements Plugin<CloudSetup> {
       base_url: baseUrl,
       trial_end_date: trialEndDate,
       is_elastic_staff_owned: isElasticStaffOwned,
+      csp,
     } = this.config;
 
     let decodedId: DecodedCloudId | undefined;
@@ -94,6 +96,7 @@ export class CloudPlugin implements Plugin<CloudSetup> {
       organizationId: this.config.organization_id,
       deploymentId: parseDeploymentIdFromDeploymentUrl(this.config.deployment_url),
       cname,
+      csp,
       baseUrl,
       ...this.getCloudUrls(),
       elasticsearchUrl: decodedId?.elasticsearchUrl,

x-pack/plugins/cloud/public/types.ts

@@ -111,6 +111,12 @@ export interface CloudSetup {
    * @example `cloud.elastic.co`
    */
   cname?: string;
+  /**
+   * The cloud service provider identifier.
+   *
+   * @note Expected to be one of `aws`, `gcp` or `azure`, but could be something different.
+   */
+  csp?: string;
   /**
    * This is the URL of the Cloud interface.
    */

x-pack/plugins/cloud/server/config.ts

@@ -22,6 +22,7 @@ const configSchema = schema.object({
   apm: schema.maybe(apmConfigSchema),
   base_url: schema.maybe(schema.string()),
   cname: schema.maybe(schema.string()),
+  csp: schema.maybe(schema.string()),
   deployments_url: schema.string({ defaultValue: '/deployments' }),
   deployment_url: schema.maybe(schema.string()),
   id: schema.maybe(schema.string()),
@@ -59,6 +60,7 @@ export const config: PluginConfigDescriptor<CloudConfigType> = {
   exposeToBrowser: {
     base_url: true,
     cname: true,
+    csp: true,
     deployments_url: true,
     deployment_url: true,
     id: true,

x-pack/plugins/cloud/server/plugin.test.ts

@@ -30,6 +30,7 @@ describe('Cloud Plugin', () => {
       ...baseConfig,
       id: 'cloudId',
       cname: 'cloud.elastic.co',
+      csp: 'aws',
       ...configParts,
     });
     const plugin = new CloudPlugin(initContext);
@@ -77,6 +78,11 @@ describe('Cloud Plugin', () => {
         );
       });
 
+      it('exposes csp', () => {
+        const { setup } = setupPlugin();
+        expect(setup.csp).toBe('aws');
+      });
+
       it('exposes components decoded from the cloudId', () => {
         const decodedId: DecodedCloudId = {
           defaultPort: '9000',

x-pack/plugins/cloud/server/plugin.ts

@@ -35,6 +35,12 @@ export interface CloudSetup {
    * @note The `cloudId` is a concatenation of the deployment name and a hash. Users can update the deployment name, changing the `cloudId`. However, the changed `cloudId` will not be re-injected into `kibana.yml`. If you need the current `cloudId` the best approach is to split the injected `cloudId` on the semi-colon, and replace the first element with the `persistent.cluster.metadata.display_name` value as provided by a call to `GET _cluster/settings`.
    */
   cloudId?: string;
+  /**
+   * The cloud service provider identifier.
+   *
+   * @note Expected to be one of `aws`, `gcp` or `azure`, but could be something different.
+   */
+  csp?: string;
   /**
    * The Elastic Cloud Organization that owns this deployment/project.
    */
@@ -199,6 +205,7 @@ export class CloudPlugin implements Plugin<CloudSetup, CloudStart> {
     return {
       ...this.getCloudUrls(),
       cloudId: this.config.id,
+      csp: this.config.csp,
       organizationId,
       instanceSizeMb: readInstanceSizeMb(),
       deploymentId,