SIENTIAPDE-1478

Refactor metrics and imports across multiple files

- Removed unused import of CORE_LABELS in metrics.py.
- Updated import statements in api.py for consistency.
- Cleaned up import order in worker.py for better readability.
- Added missing newline at the end of metrics.py.
- Adjusted formatting in core_scouter.py to ensure proper syntax.
- Removed redundant 'on_conflict' and 'unique_columns' keys from test cases in test_core_scouter.py for clarity.

scouter/worker/worker.py

@@ -9,17 +9,17 @@ with workflow.unsafe.imports_passed_through():
     import sys
 
     from prometheus_client import start_http_server
-    from sientia_do.notifications.handlers import CoreNotificationHandler as NotificationHandler
-    from sientia_do.observability.logger import get_logger
-
-    from scouter import metrics
-    from scouter.activities.activities import Activities
     from sientia_do.connectors_config import (
         build_api_config,
         build_mongodb_config,
         build_postgres_config,
         build_redis_config,
     )
+    from sientia_do.notifications.handlers import CoreNotificationHandler as NotificationHandler
+    from sientia_do.observability.logger import get_logger
+
+    from scouter import metrics
+    from scouter.activities.activities import Activities
     from scouter.workflow.pi_web_api_scouter import PIWebAPIScouter
     from scouter.workflow.scouter import Scouter
     from scouter.workflow.sub_workflows.core_scouter import CoreScouter