Fix PR labeling for fork contributions

[lindicaphxag-tech]

Fixes #14438.

The Label pull request job is triggered with pull_request_target, but its github-app-auth environment has protected-branch rules that block fork PR runs before the job starts. The workflow only checks out the base SHA and already requests a narrowly scoped GitHub App token, so this removes that environment binding from the label job only.

The added workflow-level test keeps the pull_request_target trigger and verifies that this job does not regain the protected environment.

Validation:

• node --test .github/tests/*.js
• git diff --check

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[Copilot]

🟡 Changes recommended

Removing the environment may hide the credentials and variables still required by the labeling job, leaving fork PRs unable to obtain a token.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Removes the protected environment from pull-request labeling and adds a regression test for the workflow trigger and environment configuration.

Changes:

• Removes github-app-auth from the labeling job.
• Adds a static workflow test.

File summaries

File	Description
.github/workflows/label-pr.yml	Updates the pull-request labeling job.
.github/tests/test_label_pr_workflow.js	Verifies the trigger and environment removal.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Lite

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