ref(transport): Remove redundant background task set

GH-4582

Author: srothh

sentry_sdk/transport.py

@@ -594,7 +594,6 @@ def __init__(self: Self, options: Dict[str, Any]) -> None:
             super().__init__(options)
             # Requires event loop at init time
             self.loop = asyncio.get_running_loop()
-            self.background_tasks: set[asyncio.Task[None]] = set()
 
         def _create_worker(self: Self, options: dict[str, Any]) -> Worker:
             return AsyncWorker(queue_size=options["transport_queue_size"])
@@ -792,9 +791,6 @@ def kill(self: Self) -> Optional[asyncio.Task[None]]:  # type: ignore
 
             logger.debug("Killing HTTP transport")
             self._worker.kill()
-            for task in self.background_tasks:
-                task.cancel()
-            self.background_tasks.clear()
             try:
                 # Return the pool cleanup task so caller can await it if needed
                 return self.loop.create_task(self._pool.aclose())  # type: ignore