[Chore] Remove third-party testing internals from test snapshots (#19…

…2747)

## Summary

This removes some indavertent testing of third-party
APIs/implementations caused by directly passing the result of a
`render()` call to `toMatchSnapshot()`.

In all cases, this was solved by passing `render().container` (the root
element rendered by the testing library) instead.

These changes remove implementation details of both styled-components
(#192368 being the reason for this commit) and testing-library from the
snapshots.


### Checklist


- [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

packages/kbn-securitysolution-autocomplete/src/field/__tests__/index.test.tsx

@@ -31,7 +31,7 @@ describe('FieldComponent', () => {
         selectedField={getField('machine.os.raw')}
       />
     );
-    expect(wrapper).toMatchSnapshot();
+    expect(wrapper.container).toMatchSnapshot();
     const comboBox = wrapper.getByTestId('fieldAutocompleteComboBox');
     const input = within(comboBox).getByRole('combobox');
     expect(input).toHaveAttribute('value', 'machine.os.raw');
@@ -52,7 +52,7 @@ describe('FieldComponent', () => {
         selectedField={getField('machine.os.raw')}
       />
     );
-    expect(wrapper).toMatchSnapshot();
+    expect(wrapper.container).toMatchSnapshot();
     expect(wrapper.getByTestId('fieldAutocompleteComboBox').querySelector('input')).toBeDisabled();
   });
   it('should render the loading spinner if isLoading is true when clicked', () => {
@@ -72,7 +72,7 @@ describe('FieldComponent', () => {
       />
     );
     const fieldAutocompleteComboBox = wrapper.getByTestId('fieldAutocompleteComboBox');
-    expect(wrapper).toMatchSnapshot();
+    expect(wrapper.container).toMatchSnapshot();
     fireEvent.click(fieldAutocompleteComboBox);
     expect(wrapper.getByRole('progressbar')).toBeInTheDocument();
   });
@@ -92,7 +92,7 @@ describe('FieldComponent', () => {
         selectedField={getField('machine.os.raw')}
       />
     );
-    expect(wrapper).toMatchSnapshot();
+    expect(wrapper.container).toMatchSnapshot();
     expect(wrapper.getByTestId('comboBoxClearButton')).toBeInTheDocument();
   });
   it('should change the selected value', async () => {