Fix label check on fork-submitted PRs

[bharvey88]

Version: no bump (workflows only, does not publish)

What does this implement/fix?

Label check fails on fork-submitted PRs (e.g. #43: "Apply Single Label"
step) because it runs inside ci.yml under plain pull_request, which gets a
read-only token for forks. Moves it to a standalone workflow on
pull_request_target so it gets a write token, matching the fix already
rolled out to the other product repos in June (e.g. AIR-1). Safe because
the called workflow only reads the PR body and never checks out or executes
PR code; the shared workflow was hardened for pull_request_target callers
in ApolloAutomation/Workflows when the other repos switched. ci.yml
permissions are trimmed to contents: read since the build jobs need nothing
more.

Takes effect once merged to the default branch (pull_request_target runs
the base branch's workflow definition), so it won't turn #43 green
retroactively — #43 already has its label applied manually.

Types of changes

• Bugfix (fixed change that fixes an issue)
• New feature (thanks!)
• Breaking change (repair/feature that breaks existing functionality)
• Dependency Update - Does not publish
• Other - Does not publish
• Website of github readme file update - Does not publish
• Github workflows - Does not publish

Checklist / Checklijst:

• The code change has been tested and works locally
• The code change has not yet been tested

If user-visible functionality or configuration variables are added/modified:

• Added/updated documentation for the web page

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1b1bfc9b-08de-476e-81f0-281ef9a7bb54

📥 Commits

Reviewing files that changed from the base of the PR and between 3f52f2e and 58e7163.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/label-check.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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