Suggested test: copilot/dismiss-pull-request-review-bot-author

## Motivation

github/gh-aw#49648 — `dismiss_pull_request_review.cjs` now exempts bot accounts (`reviewAuthor.endsWith("[bot]")`) from the author-match guard, allowing a workflow to dismiss a review it authored as `github-actions[bot]` (previously rejected with "review author must match dismisser"). No existing test exercises `dismiss-pull-request-review` at all.

## Proposed test

- **Workflow file**: `test-copilot-dismiss-pull-request-review.md`
- **Trigger**: `workflow_dispatch` with `pull_request_number` and `review_id` inputs
- **Engine**: copilot
- **Safe output**: `dismiss-pull-request-review`
- **Variant**: standard

## Minimal test prompt sketch

Have the agent call `dismiss-pull-request-review` on a review previously left by the bot/token itself (created via a prior `submit-pull-request-review` step or pre-seeded), passing a dismissal message, and assert success rather than an author-mismatch error.

## New fixtures or secrets needed

Needs a PR with an existing bot-authored review to dismiss. Could self-seed within the workflow: create a throwaway PR + submit a review with `GH_AW_TEST_PAT`/default token, then dismiss it in the same run. Uses existing `GH_AW_TEST_PAT` secret; no new fixture repo required.

## Notes

Overlaps conceptually with `test-copilot-submit-pull-request-review.md` and `test-copilot-resolve-pull-request-review-thread.md` for setup patterns (self-seeding a PR/review via workflow_dispatch inputs). This is a distinct safe-output type with no current coverage.

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Start with the proposed test file test-copilot-dismiss-pull-request-review.md and compare setup patterns in test-copilot-submit-pull-request-review.md and test-copilot-resolve-pull-request-review-thread.md. Use workflow_dispatch inputs and the existing GH_AW_TEST_PAT or default token to create a bot-authored review. Done means the dismiss-pull-request-review safe output succeeds without an author-mismatch error.

Written by the indexing model from the issue text.