fix(tasks): Add type hints to scheduler signal handler and task

Added proper type hints to the `log_task_failure` signal handler and the `scheduler` task function to fix type checking errors.

- Added type annotations for all signal handler parameters
- Added `self: Task` parameter to scheduler function (required when bind=True)
- Added pylint directives for unused arguments
- Fixed logging to use % formatting instead of f-strings
- Added null check for sender before accessing .name attribute

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

superset/tasks/scheduler.py

@@ -41,19 +41,33 @@ from superset.utils.log import get_logger_from_status
 
 logger = logging.getLogger(__name__)
 
+
 @task_failure.connect
-def log_task_failure(sender=None, task_id=None, exception=None, args=None, kwargs=None, traceback=None, einfo=None, **kw):
-    logger.exception(f"Celery task {sender.name} failed: {exception}", exc_info=einfo)
+def log_task_failure(  # pylint: disable=unused-argument
+    sender: Task | None = None,
+    task_id: str | None = None,
+    exception: Exception | None = None,
+    args: tuple[Any, ...] | None = None,
+    kwargs: dict[str, Any] | None = None,
+    traceback: Any = None,
+    einfo: Any = None,
+    **kw: Any,
+) -> None:
+    task_name = sender.name if sender else "Unknown"
+    logger.exception("Celery task %s failed: %s", task_name, exception, exc_info=einfo)
 
 
 @celery_app.task(
     name="reports.scheduler",
     bind=True,
     autoretry_for=(Exception,),
-    retry_kwargs={"max_retries": 3, "countdown": 60},  # Retry up to 3 times, wait 60s between
+    retry_kwargs={
+        "max_retries": 3,
+        "countdown": 60,
+    },  # Retry up to 3 times, wait 60s between
     retry_backoff=True,  # exponential backoff
 )
-def scheduler() -> None:
+def scheduler(self: Task) -> None:  # pylint: disable=unused-argument
     """
     Celery beat main scheduler for reports
     """