feat: set the preemptible priority to -5

-10 is exactly the default cluster-autoscaler expendable-pods-priority-cutoff.
-5 keeps preemptible pods below placeholders and sessions, with a margin above
the cutoff so they still trigger a scale-up.

Author: wesjdj

components/renku_data_services/crc/db.py

@@ -1912,7 +1912,7 @@ async def delete(self, api_user: base_models.APIUser, cluster_id: ULID) -> None:
 
 
 SESSION_PRIORITY_VALUE = 100
-PREEMPTIBLE_PRIORITY_VALUE = -10
+PREEMPTIBLE_PRIORITY_VALUE = -5
 
 
 @dataclass