feat: release pipelines beta

[gagantrivedi]

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

• 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?
• I have used a Conventional Commit title for this Pull Request

Changes

Update Release pipelines module to support the following:

• Add email notification when feature completes a stage
• Add ordering and page_size support to release pipelines API
• Update API to support wait for trigger UI
• Add created_at field to the release pipelines model (to support wait for trigger and order by)

How did you test this code

Add unit tests

[vercel]

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored	Preview		Aug 19, 2025 8:27am
flagsmith-frontend-preview	Ignored	Preview		Aug 19, 2025 8:27am
flagsmith-frontend-staging	Ignored	Preview		Aug 19, 2025 8:27am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.86%. Comparing base (e5740aa) to head (b05ee25).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5930      +/-   ##
==========================================
+ Coverage   97.84%   97.86%   +0.01%     
==========================================
  Files        1261     1273      +12     
  Lines       44899    45154     +255     
==========================================
+ Hits        43933    44188     +255     
  Misses        966      966              

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[Zaimwa9]

Just a comment to address in the migration, otherwise looks good

[Zaimwa9]

👍

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5930	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-5930	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5930	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5930	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5930	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5930	Finished ✅	Results ✅