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

[emyller]

Thanks for submitting a PR! Please check the boxes below:

• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Contributes to #6945

• Don't query code references unless code_references_ui_stats is enabled.

Important

• Needs to review and merge chore: update Flagsmith environment document #6968 — order is not critical.

How did you test this code?

• Added / updated unit tests to is_feature_enabled.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Mar 19, 2026 6:01pm
flagsmith-frontend-preview	Ignored	Preview	Mar 19, 2026 6:01pm
flagsmith-frontend-staging	Ignored	Preview	Mar 19, 2026 6:01pm

[github-actions]

Docker builds report

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

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Failed tests

firefox › tests/change-request-test.pw.ts › Change Request Tests › Change requests can be created, approved, and published with 4-eyes approval @enterprise
firefox › tests/roles-test.pw.ts › Roles Tests › Roles can be created with project and environment permissions @enterprise

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.32%. Comparing base (aafc84b) to head (912a0cb).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6970   +/-   ##
=======================================
  Coverage   98.32%   98.32%           
=======================================
  Files        1335     1335           
  Lines       49863    49876   +13     
=======================================
+ Hits        49026    49039   +13     
  Misses        837      837           

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[kyle-ssg]

Im a bit confused why this has any FE changes, but either way this now shows the following for a project that doesn't have code references integrated.

[khvn26]

LGTM 👍