feat(Features API): Restrict code references querying to a feature flag

[emyller]

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Changes

Contributes to #6945

• Don't query code references unless code_references_ui_stats is enabled.
• Suggest a new util is_feature_enabled we should use more often!

Important

Also needs to review and merge #6968 — order is not critical.

How did you test this code?

• Added unit tests to is_feature_enabled.
• Verified changes in the frontend.

[claude]

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Project	Deployment	Actions	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	Mar 17, 2026 4:04am
flagsmith-frontend-staging	Ready	Preview, Comment	Mar 17, 2026 4:04am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Mar 17, 2026 4:04am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6970	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6970	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-e2e:pr-6970	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith:pr-6970	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6970	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6970	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 10 passed

Details

 10 tests across 7 suites
 28.3 seconds
 8cdf16b
 🔄 Run: #15318 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 10 passed

Details

 10 tests across 7 suites
 27.8 seconds
 8cdf16b
 🔄 Run: #15318 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 16 passed

Details

 16 tests across 13 suites
 1 minute, 1 second
 8cdf16b
 🔄 Run: #15318 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 1 passed

Details

 1 test across 1 suite
 55.9 seconds
 8cdf16b
 🔄 Run: #15318 (attempt 1)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.31%. Comparing base (0d68a05) to head (8cdf16b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6970   +/-   ##
=======================================
  Coverage   98.31%   98.31%           
=======================================
  Files        1335     1335           
  Lines       49760    49793   +33     
=======================================
+ Hits        48923    48956   +33     
  Misses        837      837           

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