[Security Solution][Endpoint] Re-enable execute api integration tests (…

…#175082)

## Summary

Re-enable `execute` api integration tests

closes /issues/171666
closes /issues/171667

### Flaky runner
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/4904
x 100 ( all pass )

### 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] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed

---------

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

x-pack/test/security_solution_endpoint_api_int/apis/endpoint_response_actions/execute.ts

@@ -16,8 +16,6 @@ export default function ({ getService }: FtrProviderContext) {
   const supertestWithoutAuth = getService('supertestWithoutAuth');
   const endpointTestResources = getService('endpointTestResources');
 
-  // FLAKY: https://github.com/elastic/kibana/issues/171666
-  // FLAKY: https://github.com/elastic/kibana/issues/171667
   describe('Endpoint `execute` response action', function () {
     targetTags(this, ['@ess', '@serverless']);
 
@@ -30,7 +28,9 @@ export default function ({ getService }: FtrProviderContext) {
     });
 
     after(async () => {
-      await endpointTestResources.unloadEndpointData(indexedData);
+      if (indexedData) {
+        await endpointTestResources.unloadEndpointData(indexedData);
+      }
     });
 
     it('should not allow `execute` action without required privilege', async () => {