feat: add favorite task templates and optimize evidence exports

apps/admin_console/services/exploration_deletion.py

@@ -32,7 +32,7 @@ def delete_exploration(repository: ExplorationStore, exploration_id: str) -> lis
     # Validation sessions and batch copies remain ordinary Flash/Pro history.
     deleted = [run["id"] for run in runs if run["kind"] == "exploration"]
     storage = StorageManager(repository.database.path, report_export.TRACES_PATH)
-    with report_export.EXPORT_LOCK:
+    with report_export.export_lock(*("session:" + run_id for run_id in deleted)):
         for run_id in deleted:
             safe_id = str(UUID(run_id))
             storage.delete_session(UUID(safe_id))