Repair wp/6.6 branch Actions: Only run PR label enforcement on open pull requests

[desrosj]

Part of #82784.

What?

enforce-pr-labels.yml's type-related-labels job now skips execution once a pull request is no longer open, by adding if: ${{ github.event.pull_request.state == 'open' }} to the job.

Why?

The job previously ran on any PR matching its trigger types (labeled, unlabeled, ready_for_review, review_requested) regardless of whether the PR was still open, including closed or merged PRs where the check no longer serves any purpose.

How?

Ported the applicable piece of trunk's d410e57a781b4bac0acb481f3916d2cf80b54a02 ("Only run label enforcement workflow on open PRs.", #76274). Trunk's two other related commits (switching to pull_request_target and updating the types: list) were checked and found already present verbatim in this branch's copy of the file, so only the if: condition itself was genuinely missing here.

The existing job-level permissions: pull-requests: write block was left completely untouched — this change is a single added line.

Use of AI Tools

This PR was created by Claude Code under my supervision. All code should be treated as AI-produced and not yet reviewed by a human until this PR is marked Ready for Review.

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