♻️(backend) clarify storage hook message for intentionally ignored req

Update the response message to explicitly state that certain
notifications are ignored on purpose, avoiding confusion
during debugging or log inspection.

src/backend/core/api/viewsets.py

@@ -762,14 +762,14 @@ class RecordingViewSet(
         except InvalidBucketError as e:
             raise drf_exceptions.PermissionDenied("Invalid bucket specified") from e
 
-        except InvalidFilepathError as e:
+        except InvalidFilepathError:
             return drf_response.Response(
-                {"message": f"Ignore this filepath, {e}"},
+                {"message": "Notification ignored."},
             )
 
-        except InvalidFileTypeError as e:
+        except InvalidFileTypeError:
             return drf_response.Response(
-                {"message": f"Ignore this file type, {e}"},
+                {"message": "Notification ignored."},
             )
 
         try: