Install copilot PR reviewer workflow

[stiber]

Description

Add workflow to try to get copilot PR reviewing working by specifying when it will run and which model it will use.

Checklist (Mandatory for new features)

• Added Documentation
• Added Unit Tests

Testing (Mandatory for all changes)

• GPU Test: test-medium-connected.xml Passed
• GPU Test: test-large-long.xml Passed

[Copilot]

Pull request overview

Adds a GitHub Actions workflow intended to run an automated Copilot-based pull request review, including configuration for trigger conditions and model settings.

Changes:

• Added a new workflow that triggers on PR open/sync/reopen events.
• Configured the workflow to run github/copilot-pr-reviewer@v1 with gpt-4.1 and specified generation parameters.

[Copilot]

This workflow is triggered via pull_request but it depends on ${{ secrets.OPENAI_API_KEY }}. For pull requests coming from forks, GitHub Actions does not provide repository secrets, so the reviewer step will fail or be skipped. If you want this reviewer to work on fork PRs, consider using a pull_request_target-based design that avoids checking out/running untrusted PR code, or gate the job so it only runs when the secret is available (and/or when github.event.pull_request.head.repo.full_name == github.repository).

[Copilot]

The workflow grants pull-requests: write and uses a third-party action. Please pin github/copilot-pr-reviewer to an immutable commit SHA (instead of @v1) to reduce supply-chain risk from tag updates.

Suggested change

	uses: github/copilot-pr-reviewer@v1
	uses: github/copilot-pr-reviewer@<FULL_40_CHARACTER_COMMIT_SHA>

[stiber]

It appears that this workflow isn't necessary; something must have been fixed behind the scenes in GitHub. Commit will be reverted.