[Security Solution][Endpoint] Re-enable responder FTR test (#172303)

## Summary

Re-enable responder FTR tests
fixes  elastic/kibana/issues/170435

related to 
- elastic/kibana/pull/169239
- elastic/kibana/pull/171711

**Flaky runner**
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/4112
x 100 ( all fail )

 _with tour popup fix_
-
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/4120
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-pack/test/security_solution_endpoint/apps/endpoint/responder.ts

@@ -82,8 +82,7 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
     );
   };
 
-  // FLAKY: https://github.com/elastic/kibana/issues/170435
-  describe.skip('Response Actions Responder', function () {
+  describe('Response Actions Responder', function () {
     targetTags(this, ['@ess', '@serverless']);
 
     let indexedData: IndexedHostsAndAlertsResponse;
@@ -197,8 +196,12 @@ export default ({ getPageObjects, getService }: FtrProviderContext) => {
         await testSubjects.clickWhenNotDisabled('endpointResponseActions-action-item');
         await testSubjects.existOrFail('consolePageOverlay');
 
-        await performResponderSanityChecks();
+        // close tour popup
+        if (await testSubjects.exists('timeline-save-tour-close-button')) {
+          await testSubjects.click('timeline-save-tour-close-button');
+        }
 
+        await performResponderSanityChecks();
         await pageObjects.timeline.closeTimeline();
       });
     });