fix(deletions) Improve AlertRule deletions #28999
Merged
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While the previous fix solved for active alert rules I didn't notice that the default object manager for AlertRules excludes snapshot status records. These records are causing deletions to fail now as they hold references to Environment via SnubaQuery. When Django cascades deletes for Environment records it ends up in the post_delete signal and fails.
Fixes SENTRY-SAB