[Cases] Fix flaky tests in the CaseViewPage component (#172940)

## Summary

Tests:

- `renders tabs correctly`: Moved to functional testing
- `renders the activity tab by default`: Removed. It is being tested in
functional testing
- `renders the activity tab when the query parameter tabId has
activity`: Moved to functional testing
- `renders the activity tab when the query parameter tabId has an
unknown value`: Moved to functional testing
- `navigates to the activity tab when the activity tab is clicked`:
Moved to functional testing
- `should show closed indicators in header when case is closed`: Moved
to
`x-pack/plugins/cases/public/components/case_action_bar/index.test.tsx`
- `should push updates on button click`: Moved to
`x-pack/plugins/cases/public/components/edit_connector/index.test.tsx`
- `should disable the push button when connector is invalid`: Moved to
`x-pack/plugins/cases/public/components/edit_connector/index.test.tsx`
- `should show the rule name`: Already tested in
`x-pack/plugins/cases/public/components/user_actions/comment/alert_event.test.tsx`
- `should show the correct connector name on the push button`: Moved to
`x-pack/plugins/cases/public/components/edit_connector/index.test.tsx`
- `Callouts`: Already tested in
`x-pack/plugins/cases/public/components/use_push_to_service/index.test.tsx`
- `should display the alerts tab when the feature is enabled`: Moved to
`x-pack/plugins/cases/public/components/case_view/case_view_tabs.test.tsx`
- `should not display the alerts tab when the feature is disabled`:
Moved to
`x-pack/plugins/cases/public/components/case_view/case_view_tabs.test.tsx`
- `should not show the experimental badge on the alerts table`: Moved to
`x-pack/plugins/cases/public/components/case_view/case_view_tabs.test.tsx`
- `should show the experimental badge on the alerts table`: Moved to
`x-pack/plugins/cases/public/components/case_view/case_view_tabs.test.tsx`
- `renders the alerts tab when the query parameter tabId has alerts`:
Unskip functional test
- `navigates to the alerts tab when the alerts tab is clicked`: Removed.
It is being tested in functional testing
- `shows the connectors in the sidebar`: Removed. It is being tested in
functional testing
- `shows the case action bar`: Removed. It is being tested in functional
testing
- `should show loading content when loading user actions stats`:
Removed. Already tested in
`x-pack/plugins/cases/public/components/case_view/components/case_view_activity.test.tsx`
- `should call show alert details with expected arguments`: Removed.
Already tested in
`x-pack/plugins/cases/public/components/user_actions/comment/comment.test.tsx`
- `should show the case tabs`: Moved to functional testing
- `should display description when case is loading`: Moved to
`x-pack/plugins/cases/public/components/description/index.test.tsx`
- `renders the description correctly`: Removed. Already tested in
`x-pack/plugins/cases/public/components/description/index.test.tsx`
- `should update settings`: Removed. Already tested in
`x-pack/plugins/cases/public/components/case_action_bar/index.test.tsx`



Fixes: #149778,
#149777,
#149776,
#170532,
#171718,
#149771,
#173136

Flaky test runner:
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/4862

Successful builds:
https://buildkite.com/elastic/kibana-pull-request/builds?branch=cnasikas%3Afix_149777

### Checklist

Delete any items that are not applicable to this PR.

- [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

### For maintainers

- [x] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Kibana Machine <[email protected]>

x-pack/plugins/cases/public/components/case_action_bar/index.test.tsx

@@ -10,7 +10,7 @@ import { mount } from 'enzyme';
 import { render, screen, waitFor } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 
-import { basicCase } from '../../containers/mock';
+import { basicCase, basicCaseClosed } from '../../containers/mock';
 import type { CaseActionBarProps } from '.';
 import { CaseActionBar } from '.';
 import {
@@ -74,6 +74,18 @@ describe('CaseActionBar', () => {
     );
   });
 
+  it('should show the status as closed when the case is closed', () => {
+    const wrapper = mount(
+      <TestProviders>
+        <CaseActionBar {...defaultProps} caseData={basicCaseClosed} />
+      </TestProviders>
+    );
+
+    expect(wrapper.find(`[data-test-subj="case-view-status-dropdown"]`).first().text()).toBe(
+      'Closed'
+    );
+  });
+
   it('should show the correct date', () => {
     const wrapper = mount(
       <TestProviders>