ci: Ensure one active flagsmith-charts PR

[khvn26]

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

This prevents bloat in the flagsmith-charts repo by closing all stale PRs before creating a new one on release.

How did you test this code?

This is a CI change that will have to be merged and tested on the next release.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jun 12, 2025 1:09pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jun 12, 2025 1:09pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jun 12, 2025 1:09pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5567	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5567	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5567	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5567	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5567	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5567	Finished ✅	Results ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (main@50cac6f). Learn more about missing BASE report.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5567   +/-   ##
=======================================
  Coverage        ?   97.69%           
=======================================
  Files           ?     1247           
  Lines           ?    44249           
  Branches        ?        0           
=======================================
  Hits            ?    43231           
  Misses          ?     1018           
  Partials        ?        0           

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