Auto merge of #107704 - jyn514:tidy-ci, r=Mark-Simulacrum

Run `expand-yaml-anchors` in `x test tidy`

Previously, the pre-commit hook which runs `x test tidy` could pass only to have CI fail within the first 30 seconds. This adds about 30 seconds to `test tidy` (for an initial run, much less after the tool is built the first time) in exchange for catching errors in `.github/workflows/ci.yml` before they're pushed.

Author: bors