SIENTIAPDE-1445

Refactor imports and enhance timestamp handling in API and test files

- Removed redundant import statements in api.py and prepare_worker.py for cleaner code.
- Updated timestamp format in test cases to include timezone information for consistency.
- Adjusted test configurations to align with new API structure for improved accuracy in data handling.

scouter/worker/worker.py

@@ -20,9 +20,9 @@ with workflow.unsafe.imports_passed_through():
         build_postgres_config,
         build_redis_config,
     )
+    from scouter.workflow.pi_web_api_scouter import PIWebAPIScouter
     from scouter.workflow.scouter import Scouter
     from scouter.workflow.sub_workflows.core_scouter import CoreScouter
-    from scouter.workflow.pi_web_api_scouter import PIWebAPIScouter
 
 # Environment configuration
 POD_ID = os.getenv('HOSTNAME', 'localhost')