address unreachable statement warnings in test cases

Co-authored-by: Copilot <copilot@github.com>

Author: Kanchan-Microsoft

src/tests/backend/common/database/test_database_base.py

@@ -501,7 +501,7 @@ async def get_team_agent(self, team_id, agent_name): return None
                 raise ValueError("Test exception")
 
         # Even with exception, close should have been called
-        assert database.closed is True
+        assert database.closed is True  # lgtm[py/unreachable-statement]
 
 
 class TestDatabaseBaseInheritance:

src/tests/backend/v4/config/test_settings.py

@@ -344,7 +344,7 @@ async def cancel_task():
         cancel_task_handle = asyncio.create_task(cancel_task())
 
         with self.assertRaises(asyncio.CancelledError):
-            await task
+            await task  # lgtm[py/statement-has-no-effect]
 
         _ = await cancel_task_handle
         self.assertTrue(task.cancelled())
@@ -365,7 +365,7 @@ async def cancel_task():
         cancel_task_handle = asyncio.create_task(cancel_task())
 
         with self.assertRaises(asyncio.CancelledError):
-            await task
+            await task  # lgtm[py/statement-has-no-effect]
 
         _ = await cancel_task_handle
         self.assertTrue(task.cancelled())