fix(setup): make step 39 repeatable (#9085)

# Which Problems Are Solved

When downgrading zitadel and upgrading it again, it might be that orgs
deleted in this period still have stale entries in the fields table.

# How the Problems Are Solved

- Make the cleanup repeatable
- Scope the query by instance so that an index is used.

cmd/setup/39.sql

@@ -3,6 +3,7 @@ WHERE aggregate_type = 'org'
 AND aggregate_id IN (
 	SELECT aggregate_id
 	FROM eventstore.events2
-	WHERE aggregate_type = 'org'
+	WHERE instance_id = $1
+	AND aggregate_type = 'org'
 	AND event_type = 'org.removed'
 );