fix(surveys): simplify migration 0905 to only add column

Author: adboio

posthog/migrations/0905_survey_add_linked_insight.py

@@ -37,14 +37,6 @@ class Migration(migrations.Migration):
                     ALTER TABLE "posthog_survey" DROP COLUMN IF EXISTS "linked_insight_id";
                     """,
                 ),
-                migrations.RunSQL(
-                    """
-                    CREATE INDEX CONCURRENTLY IF NOT EXISTS "posthog_survey_linked_insight_id_586524f3" ON "posthog_survey" ("linked_insight_id");
-                    """,
-                    reverse_sql="""
-                        DROP INDEX IF EXISTS "posthog_survey_linked_insight_id_586524f3";
-                    """,
-                ),
             ],
         )
     ]