ci(GHA): Collect feature flag code references using flagsmith/ci

[emyller]

Our Code References feature is going GA! Starting with the GitHub integration.

Contributes to #5704 and #6510.

---

TODO:

• Experiment with new CI tooling at feat: Collect and upload feature flag code references ci#4
• Point to v1.0.0 when released: chore(main): release 1.0.0 ci#3

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Jan 30, 2026 11:19pm
flagsmith-frontend-preview	Ignored	Preview	Jan 30, 2026 11:19pm
flagsmith-frontend-staging	Ignored	Preview	Jan 30, 2026 11:19pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.18%. Comparing base (a0d5aa9) to head (198df6f).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6590   +/-   ##
=======================================
  Coverage   98.18%   98.18%           
=======================================
  Files        1295     1295           
  Lines       46920    46968   +48     
=======================================
+ Hits        46067    46115   +48     
  Misses        853      853           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6590	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-6590	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6590	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6590	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6590	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6590	Finished ✅	Results ✅

[khvn26]

LGTM 👍