fix(ingester): Do not await empty file notification disk protection

It's possible that this could never happen (or be very slow), while
the evaluation and enforcement of disk protection happens in another
thread. Blocking further clean-up on this condition might wedge the
ingest state!

ingester/src/wal/disk_full_protection.rs

@@ -80,8 +80,6 @@ where
             "rotated wal to allow disk clean-up to occur",
         );
 
-        let empty_waker = self.wal_reference_handle.empty_inactive_notifier();
-
         _ = self
             .wal_reference_handle
             .enqueue_rotated_file(closed_segment.id(), sequence_number_set)
@@ -90,9 +88,6 @@ where
 
         persist_partitions(self.buffer.partition_iter(), &self.persist).await;
         info!(closed_id = %closed_segment.id(), "partitions persisted to allow disk clean-up to occur");
-
-        empty_waker.await;
-        info!(closed_id = %closed_segment.id(), "segment file cleaned up from disk");
     }
 }