feat: (DSO-2330) Update set-env action to support new convention

[javiercm1410]

Summary

Update action to support new convention

---

Note

Add package tag and FORCE_REF support to environment-detection action and introduce comprehensive CI tests covering tags, branches, invalid refs, and PR context.

• Action (action.yml):
  • Add FORCE_REF override to simulate refs; enhance debug output and safe file writes.
  • Broaden version matching with robust regex; support standard vX.Y.Z/vX.Y.Z-uat.N and package refs <pkg>@X.Y.Z/<pkg>@X.Y.Z-uat.N (including scoped).
  • Refine branch/event handling (exact default-branch match); clearer errors and final ENV echo.
• CI (.github/workflows/tests.yml):
  • Rename workflow/job and extend PR branches; fix CODE_OF_CONDUCT path.
  • Replace simple check with comprehensive tests:
    • Conventional prod/uat tags (v1.0.0, v1.0.0-uat.1).
    • Package prod/uat refs (@gbh-tech/internal-jobs@1.0.0, ...@1.0.0-uat.1).
    • Invalid tag expected failure.
    • Branch main and current PR context resolve to stage.
    • Verify ENVIRONMENT variable is set.

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[javiercm1410]

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