refactor: remove debug and test scripts for assignee functionality (#212)

- Deleted `debug_assignee.py` and `test_assignee_with_data.py` scripts as they are no longer needed for debugging or testing the assignee functionality.
- Updated `AssigneeDTO` and related logic in `watchlist_repository.py` to reflect changes in field names for clarity.
- Adjusted unit tests in `test_watchlist_service.py` to align with the new DTO structure.

This cleanup enhances code maintainability by removing obsolete scripts and ensuring consistency in data handling.

Co-authored-by: Amit Prakash <[email protected]>

Author: amit-flx

debug_assignee.py

@@ -6,10 +6,9 @@
 
 
 class AssigneeDTO(BaseModel):
-    id: str
-    name: str
-    email: str
-    type: str  # "user" or "team"
+    assignee_id: str
+    assignee_name: str
+    user_type: str  # "user" or "team"
 
 
 class WatchlistDTO(BaseModel):