bug: fix aws_dms_replication_task waiter issue

[aristosvo]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

If a task is already stopped due to finishing it's task, the stop reason needs to be checked to validate the reason to make sure its maybe already finished

	// The reason the replication task was stopped. This response parameter can return
	// one of the following values:
	//
	//   - "Stop Reason NORMAL" – The task completed successfully with no additional
	//   information returned.
	//
	//   - "Stop Reason RECOVERABLE_ERROR"
	//
	//   - "Stop Reason FATAL_ERROR"
	//
	//   - "Stop Reason FULL_LOAD_ONLY_FINISHED" – The task completed the full load
	//   phase. DMS applied cached changes if you set StopTaskCachedChangesApplied to
	//   true .
	//
	//   - "Stop Reason STOPPED_AFTER_FULL_LOAD" – Full load completed, with cached
	//   changes not applied
	//
	//   - "Stop Reason STOPPED_AFTER_CACHED_EVENTS" – Full load completed, with cached
	//   changes applied
	//
	//   - "Stop Reason EXPRESS_LICENSE_LIMITS_REACHED"
	//
	//   - "Stop Reason STOPPED_AFTER_DDL_APPLY" – User-defined stop task after DDL
	//   applied
	//
	//   - "Stop Reason STOPPED_DUE_TO_LOW_MEMORY"
	//
	//   - "Stop Reason STOPPED_DUE_TO_LOW_DISK"
	//
	//   - "Stop Reason STOPPED_AT_SERVER_TIME" – User-defined server time for stopping
	//   task
	//
	//   - "Stop Reason STOPPED_AT_COMMIT_TIME" – User-defined commit time for stopping
	//   task
	//
	//   - "Stop Reason RECONFIGURATION_RESTART"
	//
	//   - "Stop Reason RECYCLE_TASK"

Relations

Closes #43466

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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