feat(grouprulestatus): Add index to date_added field

[seer-by-sentry]

Fixes SENTRY-FOR-SENTRY-7MET. The issue was that: Missing index on sentry_grouprulestatus.date_added forces full table scan, exceeding database statement timeout.

• Adds an index to the date_added field in the GroupRuleStatus model.
• Creates a new migration to alter the date_added field and add the db_index=True property.

This fix was generated by Seer in Sentry, triggered by armenzg@sentry.io. 👁️ Run ID: 115

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #101080      +/-   ##
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- Coverage   81.11%    81.09%   -0.03%     
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  Files        8659      8659              
  Lines      384286    384512     +226     
  Branches    24250     24250              
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+ Hits       311714    311818     +104     
- Misses      72228     72350     +122     
  Partials      344       344              

[github-actions]

This PR has a migration; here is the generated SQL for src/sentry/migrations/0996_add_grouprulestatus_date_added_idx.py

for 0996_add_grouprulestatus_date_added_idx in sentry

--
-- Alter field date_added on grouprulestatus
--
CREATE INDEX CONCURRENTLY "sentry_grouprulestatus_date_added_7fc34e90" ON "sentry_grouprulestatus" ("date_added");