fix(worklows): More accurate legacy model use tracking

[kcons]

These rely on serializers, but there are clear legacy model usage paths, and by tagging them directly we avoid counting 0 result calls as not using legacy models.

[saponifi3d]

🛳️

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

Bugbot Autofix prepared a fix for the issue found in the latest run.

• ✅ Fixed: Missing legacy tracking in combined rules legacy path
  • Added the missing report_used_legacy_models() call after AlertRule.objects.fetch_for_organization() in the OrganizationCombinedRuleIndexEndpoint legacy path to match the fix applied to fetch_metric_alerts().

Or push these changes by commenting:

@cursor push e4732b1061

Preview (e4732b1061)

diff --git a/src/sentry/incidents/endpoints/organization_alert_rule_index.py b/src/sentry/incidents/endpoints/organization_alert_rule_index.py
--- a/src/sentry/incidents/endpoints/organization_alert_rule_index.py
+++ b/src/sentry/incidents/endpoints/organization_alert_rule_index.py
@@ -625,6 +625,7 @@
 
         # Legacy path below
         alert_rules = AlertRule.objects.fetch_for_organization(organization, projects)
+        report_used_legacy_models()
 
         issue_rules = Rule.objects.filter(
             status__in=[ObjectStatus.ACTIVE, ObjectStatus.DISABLED],

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