Refactor imports in test_routes.py for clarity

- Removed unused imports of `RunListItem`, `RunStatusEnum`, and `RunsResponse` from the test cases in `TestRouteHandlerAPIKeyValidation`.
- Streamlined the test file to improve readability and maintainability.

Author: NiveditJain

state-manager/tests/unit/test_routes.py

@@ -563,7 +563,6 @@ async def test_list_graph_templates_route_with_valid_api_key(self, mock_list_tem
 
     async def test_get_run_details_by_run_id_route_with_valid_api_key(self, mock_request):
         """Test get_run_details_by_run_id_route with valid API key"""
-        from app.models.run_models import RunListItem, RunStatusEnum
         from datetime import datetime
 
         # Arrange - Create a mock service function and mock RunListItem
@@ -626,7 +625,6 @@ async def test_get_run_details_by_run_id_route_service_error(self, mock_request)
 
     async def test_get_run_details_by_run_id_route_response_structure(self, mock_request):
         """Test get_run_details_by_run_id_route returns correct response structure"""
-        from app.models.run_models import RunListItem, RunStatusEnum
         from datetime import datetime
 
         # Arrange - Create a comprehensive mock RunListItem with all fields
@@ -820,7 +818,6 @@ async def test_re_enqueue_after_state_route_with_different_delays(self, mock_re_
     async def test_get_runs_route_with_valid_api_key(self, mock_get_runs, mock_request):
         """Test get_runs_route with valid API key"""
         from app.routes import get_runs_route
-        from app.models.run_models import RunsResponse, RunListItem, RunStatusEnum
         from datetime import datetime
 
         # Arrange - Create a comprehensive mock response
@@ -886,7 +883,6 @@ async def test_get_runs_route_with_valid_api_key(self, mock_get_runs, mock_reque
     async def test_get_runs_route_pagination_and_edge_cases(self, mock_get_runs, mock_request):
         """Test get_runs_route with different pagination scenarios and edge cases"""
         from app.routes import get_runs_route
-        from app.models.run_models import RunsResponse, RunListItem, RunStatusEnum
         from datetime import datetime
 
         # Test case 1: Empty results (page 2 with no data)