[Flaky Test] Unskips 'single-namespace types' copy to space tests (el…

…astic#150492)

closes elastic#86545
closes elastic#149544
closes elastic#149547
closes elastic#149563 

Fixed by PR elastic#149582

- [Flaky test runner on
x-pack/test/spaces_api_integration/security_and_spaces](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1880)
- [Flaky test runner on
x-pack/test/saved_object_api_integration/security_and_spaces](https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/1888)

x-pack/test/spaces_api_integration/common/suites/copy_to_space.ts

@@ -770,8 +770,7 @@ export function copyToSpaceTestSuiteFactory(context: FtrProviderContext) {
           await testDataLoader.deleteFtrSpaces();
         });
 
-        // FLAKY: https://github.com/elastic/kibana/issues/86545
-        describe.skip('single-namespace types', () => {
+        describe('single-namespace types', () => {
           beforeEach(async () => {
             await testDataLoader.createFtrSavedObjectsData(SPACE_DATA_TO_LOAD);
           });