fix: wrap enrollment sync process in a transaction to ensure atomicity

Author: BryanttV

lms/djangoapps/instructor/views/api.py

@@ -812,9 +812,10 @@ def _process_student_enrollment(self, request, course_id, data, secure):  # pyli
                     "total_students": len(identifiers),
                 }
 
-        return self._process_enrollment_sync(
-            request.user, course_key, action, identifiers, auto_enroll, email_students, reason, secure
-        )
+        with transaction.atomic():
+            return self._process_enrollment_sync(
+                request.user, course_key, action, identifiers, auto_enroll, email_students, reason, secure
+            )
 
     def _process_enrollment_sync(
         self,