Replace stale branches action with fpicalausa/remove-stale-branches

[Copilot]

Description

Replaces beatlabs/delete-old-branches-action with fpicalausa/[email protected] in the stale-branches workflow. The new action provides better control over branch exemptions and PR-aware deletion.

Configuration changes:

• Exempt branches: main, lts, next, release/* via exempt-branches-regex
• exempt-protected-branches: false - allows deletion of protected test branches
• dry-run: true by default for safer operation
• ignore-branches-with-open-prs: true - protects branches with active PRs
• 180-day staleness threshold with immediate deletion once marked
• Removed unnecessary checkout step

Breaking Changes

None. This is a workflow configuration change only.

Reviewer Guidance

Verify the regex pattern ^(main|lts|next|release/.*)$ covers all intended protected branches. The workflow will run in dry-run mode by default until explicitly disabled via workflow dispatch input.

Original prompt

On stale-branches.yml, Replace the stale branches action in this workflow with https://github.com/fpicalausa/remove-stale-branches. Make sure
that main, lts, next, and release branches are all exempted, but set exempt-protected-branches to false, since we have
protected test branches that are eligible for deletion. Set dry-run to true by default.

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