[BUG] Flaky tests in SecureWorkflowRestApiIT

[AWSHurneyt]

What is the bug?
This PR calls out that he tests in SecureWorkflowRestApiIT are flaky when executed in the Jenkins CI. The flakiness will need to be investigated and resolved.
#1166

The @Ignore annotation was causing the integ tests to fail with the following error. This PR changes the annotation to the recommended @AwaitsFix.
#1245

> Task :alerting:forbiddenApisTest FAILED
Forbidden annotation use: org.junit.Ignore [Use AwaitsFix instead]
  in org.opensearch.alerting.resthandler.SecureWorkflowRestApiIT (SecureWorkflowRestApiIT.kt, annotation on class declaration)
Scanned 120 class file(s) for forbidden API invocations (in 0.38s), 1 error(s).

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':alerting:forbiddenApisTest'.
> de.thetaphi.forbiddenapis.ForbiddenApiException: Check for forbidden API calls failed, see log.

[riysaxen-amzn]

closing in favor of #1245