fix(deletions): Delete seer matched group hash metadata first

This may fix this issue: https://sentry.sentry.io/issues/6930113529

Author: armenzg

src/sentry/deletions/defaults/group.py

@@ -273,6 +273,8 @@ def delete_group_hashes(
             #
             # If we delete the metadata first, we will not need to update the columns before deleting them.
             GroupHashMetadata.objects.filter(grouphash_id__in=hash_ids).delete()
+            if options.get("deletions.group-hashes.delete-seer-matched-hashes"):
+                GroupHashMetadata.objects.filter(seer_matched_grouphash_id__in=hash_ids).delete()
             GroupHash.objects.filter(id__in=hash_ids).delete()
 
         iterations += 1

src/sentry/options/defaults.py

@@ -342,6 +342,12 @@
     type=Int,
     flags=FLAG_AUTOMATOR_MODIFIABLE,
 )
+register(
+    "deletions.group-hashes.delete-seer-matched-hashes",
+    default=True,
+    type=Bool,
+    flags=FLAG_AUTOMATOR_MODIFIABLE,
+)
 
 register(
     "deletions.group-history.use-bulk-deletion",