Add support for allow_public flag in get_all_ex endpoint

Add `last_changed_by` field on task updates
Fix reports support

apiserver/mongo/migrations/1_9_0.py

@@ -0,0 +1,17 @@
+import logging as log
+
+from pymongo.collection import Collection
+from pymongo.database import Database
+from pymongo.errors import OperationFailure
+
+
+def migrate_backend(db: Database):
+    """
+    Drop task text index so that the new one including reports field is created
+    """
+    tasks: Collection = db["task"]
+    try:
+        tasks.drop_index("backend-db.task.main_text_index")
+    except OperationFailure as ex:
+        log.warning(f"Could not delete task text index due to: {str(ex)}")
+        pass