perf: batch fetch flag comparison data

[sentry]

Fixes WORKER-PFZ. The issue was that: Flag comparison loop executes two database queries per flag, causing an N+1 query problem.

• Previously, RepositoryFlag and CompareFlag records were fetched individually within a loop, leading to N+1 query issues.
• This change refactors the _store_flag_comparison_data method to batch fetch RepositoryFlag and CompareFlag records.
• RepositoryFlag records are now fetched in a single query for all relevant flag names.
• CompareFlag records are now fetched in a single query for all relevant repository flag IDs.
• This significantly reduces the number of database queries and improves performance.

This fix was generated by Seer in Sentry, triggered by Tom Hu. 👁️ Run ID: 10940055

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[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.24%. Comparing base (18696c1) to head (d36d2a3).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #733   +/-   ##
=======================================
  Coverage   92.24%   92.24%           
=======================================
  Files        1302     1302           
  Lines       47901    47907    +6     
  Branches     1628     1628           
=======================================
+ Hits        44188    44194    +6     
  Misses       3404     3404           
  Partials      309      309           

Flag	Coverage Δ
workerintegration	58.58% <0.00%> (-0.03%)	⬇️
workerunit	90.34% <100.00%> (+<0.01%)	⬆️

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