ci: Conform to conventional-commit when opening flagsmith-charts PRs

[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 makes the PRs update-charts job creates not fail CI, and opens nicer PRs overall.

How did you test this code?

This is a CI change; we'll have to release and see.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jul 22, 2025 9:55pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jul 22, 2025 9:55pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jul 22, 2025 9:55pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5810	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5810	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5810	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5810	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5810	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5810	Finished ✅	Results ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.82%. Comparing base (51ce137) to head (2827942).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5810   +/-   ##
=======================================
  Coverage   97.82%   97.82%           
=======================================
  Files        1257     1257           
  Lines       44700    44700           
=======================================
  Hits        43726    43726           
  Misses        974      974           

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