Harden GitHub workflows

[samdark]

Summary

• Pin reusable yiisoft/actions workflows to a commit SHA.
• Replace the Rector workflow pull_request_target trigger with pull_request.
• Set read-only GITHUB_TOKEN permissions for read-only workflows.

Validation

• zizmor --no-progress --no-exit-codes data/.github/workflows

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-zizmor-workflows

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