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.

tests/workflow/sub_workflows/test_core_scouter.py

@@ -118,8 +118,6 @@ async def test_core_scouter_workflow_success(mock_workflow, core_scouter):
                         'column': 'timestamp',
                         'format': DATETIME_FORMAT_WITH_TZ,
                     },
-                    'on_conflict': 'ignore',
-                    'unique_columns': ['model_id', 'timestamp', 'variable'],
                 },
                 retry_policy=ANY,
                 start_to_close_timeout=ANY,
@@ -305,8 +303,6 @@ async def test_core_scouter_workflow_with_zero_affected_rows(mock_workflow, core
                 'column': 'timestamp',
                 'format': DATETIME_FORMAT_WITH_TZ,
             },
-            'on_conflict': 'ignore',
-            'unique_columns': ['model_id', 'timestamp', 'variable'],
         },
         retry_policy=ANY,
         start_to_close_timeout=ANY,
@@ -377,8 +373,6 @@ async def test_core_scouter_workflow_without_debug_data_package(mock_workflow, c
                         'column': 'timestamp',
                         'format': DATETIME_FORMAT_WITH_TZ,
                     },
-                    'on_conflict': 'ignore',
-                    'unique_columns': ['model_id', 'timestamp', 'variable'],
                 },
                 retry_policy=ANY,
                 start_to_close_timeout=ANY,