[Security Solution][Endpoint] Fix and unskip flaky test (elastic#149841)

> **Note**
> **Merge after elastic/pull/149839**

## Summary

Fixes flaky test elastic/issues/145204

flaky test runners 
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1817
x 50 (failed on a single [unrelated
](https://github.com/ashokaditya/kibana/blob/92cb000a2f5116fc7408f52794cea06ad40de4bb/x-pack/test/security_solution_endpoint/apps/endpoint/artifact_entries_list.ts#L75)flaky
test)
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1826
x 150 (failed on a single run for an
[unrelated](https://github.com/ashokaditya/kibana/blob/92cb000a2f5116fc7408f52794cea06ad40de4bb/x-pack/test/security_solution_endpoint/apps/endpoint/artifact_entries_list.ts#L87)
flaky test)
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1834
x 200 (successful on all runs)
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1847
x 100 (successful on all runs)

### 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

x-pack/plugins/security_solution/public/management/pages/integration_tests/index.test.tsx

@@ -13,7 +13,6 @@ import type { AppContextTestRender } from '../../../common/mock/endpoint';
 import { createAppRootMockRenderer } from '../../../common/mock/endpoint';
 import { useUserPrivileges } from '../../../common/components/user_privileges';
 import { endpointPageHttpMock } from '../endpoint_hosts/mocks';
-import { getUserPrivilegesMockDefaultValue } from '../../../common/components/user_privileges/__mocks__';
 
 jest.mock('../../../common/components/user_privileges');
 
@@ -30,7 +29,7 @@ describe('when in the Administration tab', () => {
   });
 
   afterEach(() => {
-    useUserPrivilegesMock.mockImplementation(getUserPrivilegesMockDefaultValue);
+    useUserPrivilegesMock.mockReset();
   });
 
   describe('when the user has no permissions', () => {
@@ -97,8 +96,7 @@ describe('when in the Administration tab', () => {
     });
   });
 
-  // FLAKY: https://github.com/elastic/kibana/issues/145204
-  describe.skip('when the user has permissions', () => {
+  describe('when the user has permissions', () => {
     it('should display the Management view if user has privileges', async () => {
       useUserPrivilegesMock.mockReturnValue({
         endpointPrivileges: { loading: false, canReadEndpointList: true, canAccessFleet: true },