fix: [AXM-1877] staged content not creating after import create (#2633)

Co-authored-by: Andrii <andrii.hantkovskyi@raccoongang.com>

Author: andrii-hantkovskyi

cms/djangoapps/import_from_modulestore/admin.py

@@ -96,7 +96,7 @@ def save_model(self, request, obj, form, change):
         is_created = not getattr(obj, 'id', None)
         super().save_model(request, obj, form, change)
         if is_created:
-            save_legacy_content_to_staged_content_task.apply_async(kwargs={'import_uuid': obj.uuid})
+            save_legacy_content_to_staged_content_task.delay_on_commit(obj.uuid)
 
     def import_course_to_library_action(self, request, queryset):
         """

cms/djangoapps/import_from_modulestore/api.py

@@ -1,10 +1,6 @@
 """
 API for course to library import.
 """
-from functools import partial
-
-from django.db import transaction
-
 from .models import Import as _Import
 from .tasks import import_course_staged_content_to_library_task, save_legacy_content_to_staged_content_task
 
@@ -34,13 +30,10 @@ def create_import(source_key, user_id: int, learning_package_id: int) -> _Import
     """
     Create a new import task to import a course to a library.
     """
-    with transaction.atomic():
-        import_from_modulestore = _Import.objects.create(
-            source_key=source_key,
-            target_id=learning_package_id,
-            user_id=user_id,
-        )
-        transaction.on_commit(
-            partial(save_legacy_content_to_staged_content_task.delay, import_uuid=str(import_from_modulestore.uuid))
-        )
-        return import_from_modulestore
+    import_from_modulestore = _Import.objects.create(
+        source_key=source_key,
+        target_id=learning_package_id,
+        user_id=user_id,
+    )
+    save_legacy_content_to_staged_content_task.delay_on_commit(import_from_modulestore.uuid)
+    return import_from_modulestore