chore: Remove deprecated main_old.py file from service-adapters

### Summary of Changes
- Deleted the `main_old.py` file, which contained outdated code and was no longer in use.
- Updated type hinting in `events.py` to specify the type of events retrieved from Redis.

### Expected Results
- Cleaned up the codebase by removing unnecessary files, improving maintainability and clarity of the service-adapters module.

services/service-adapters/routes/events.py

@@ -1,5 +1,6 @@
 import json
 from datetime import datetime
+from typing import List
 
 from fastapi import APIRouter, BackgroundTasks, HTTPException, Query
 
@@ -52,7 +53,7 @@ async def publish_event(event_data: EventData, background_tasks: BackgroundTasks
 async def get_events(limit: int = Query(100, ge=1, le=1000, description="Maximum number of events to retrieve")):
     """Get recent events from the Redis message bus"""
     try:
-        events = redis_client.lrange("events", 0, limit - 1)
+        events: List[str] = redis_client.lrange("events", 0, limit - 1)
         parsed_events = []
         for event in events:
             try: