[ENG-10042] Fix/eng 10042 (#11593)

Revert BE changes meant to fix 10042 and replace with FE changes.

Author: Vlad0n20

api/actions/serializers.py

@@ -26,7 +26,6 @@
 )
 
 from osf.utils.workflows import (
-    ApprovalStates,
     DefaultStates,
     DefaultTriggers,
     ReviewStates,
@@ -279,31 +278,6 @@ def create(self, validated_data):
         comment = validated_data.pop('comment', '')
         user = validated_data.pop('user')
 
-        pending_schema_response_updates = target.schema_responses.filter(
-            reviews_state__in=[
-                ApprovalStates.UNAPPROVED.db_name,
-                ApprovalStates.PENDING_MODERATION.db_name,
-            ],
-            previous_response__isnull=False,  # Only updates, not initial submissions
-        ).order_by('-created')
-
-        if pending_schema_response_updates.exists():
-            pending_response = pending_schema_response_updates.first()
-            short_message = 'This registration has a pending update'
-            long_message = (
-                f'This registration has a pending schema response update (ID: {pending_response._id}) '
-                f'that must be moderated. Please use the schema response actions endpoint to approve or reject '
-                f'the update instead of creating a registration action.'
-            )
-            raise HTTPError(
-                http_status.HTTP_400_BAD_REQUEST,
-                data={
-                    'message_short': short_message,
-                    'message_long': long_message,
-                    'schema_response_id': pending_response._id,
-                },
-            )
-
         sanction = target.sanction
 
         try: