fix(aci): Fix QuerySubscription deletion (#103398)

We have logic to ensure that SnubaQuery deletions are triggered by
QuerySubscription deletion only if the SnubaQuery isn't used by
AlertRules or other QuerySubscriptions.

This changes it to not exclude snapshot AlertRules, as those can still
point to a SnubaQuery and fail attempts to delete it.

Fixes [SENTRY-43RZ](https://sentry.sentry.io/issues/6711913108/).

Author: kcons

src/sentry/deletions/defaults/querysubscription.py

@@ -14,7 +14,9 @@ def get_child_relations(self, instance: QuerySubscription) -> list[BaseRelation]
         from sentry.incidents.models.alert_rule import AlertRule
         from sentry.snuba.models import SnubaQuery
 
-        if not AlertRule.objects.filter(snuba_query_id=instance.snuba_query_id).exists():
+        if not AlertRule.objects_with_snapshots.filter(
+            snuba_query_id=instance.snuba_query_id
+        ).exists():
             if (
                 QuerySubscription.objects.filter(snuba_query_id=instance.snuba_query_id).count()
                 == 1