Add support for --commit-id on gh pr review #12201

Describe the feature or problem you’d like to solve

The github API supports a commit_id parameter on the PR review create operation, but this is not supported by gh pr review

Proposed solution

Add a --commit-id parameter to gh pr review.

This will allow automation to submit a review for a specific version of the code, avoiding race conditions that might cause an automation (or human user) to accidentally approve a PR after unexpected changes have been pushed to the branch.

Additional context

I have an automation in a github action that falls victim to this race condition, which is intended to smooth the process of merging PRs when using the stack-pr tool. Specifically, it:

1. reads the current commit hash
2. checks if the PR is currently awaiting approval
3. checks if there is a previously-dismissed review (by a human, not itself) with the same commit hash
4. if the checks in step 2 and step 3 are true, it approves the PR using gh pr review

If there is a push to the branch between steps 1 and 4, the script winds up approving based on an old version of the branch. Unfortunately running stack-pr submit on an existing set of PRs engineers this situation by updating the target branch (triggering the workflow) and then immediately pushing to the branch.