Tweaks to the "Commit Built File Changes" workflow

[johnbillion]

Trac ticket: https://core.trac.wordpress.org/ticket/64227 (for 7.0)
Trac ticket: https://core.trac.wordpress.org/ticket/64893 (for 7.1)

This makes the following changes:

• Removes the contents: write permission from the GitHub token, it's not needed as the app does the push
• Removes an unnecessary dance performed with the GH_APP_PRIVATE_KEY environment variable so it's just read directly instead of written to disk
• Switch to a step output to pass the app token to the next step, which prevents the access token being unnecessarily exposed to subsequent steps
• Switches to using a repository variable instead of a secret for the app ID, which is not secret (it's 1178653)

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[Copilot]

Pull request overview

This PR updates the “Commit Built File Changes” GitHub Actions workflow to reduce token permissions and secret exposure while keeping the GitHub App installation token as the mechanism used for pushing commits back to PR branches.

Changes:

• Replaces contents: write on GITHUB_TOKEN with the narrower actions: read permission needed to fetch workflow artifacts.
• Stops writing the GitHub App private key to disk; uses the secret value directly in the JWT generation step.
• Passes the GitHub App installation access token via step outputs instead of exporting it to the job environment, and switches the App ID from a secret to a repo variable.

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