meta: use HTML entities in `commit-queue` comment

When looking at the comments for commit-queue-failed, parts wrapped in < and > aren't rendered, as they are treated as HTML.

An example of this is emails, and some weird rendering for https://github.com/nodejs/node/pull/53741#issuecomment-2211732503, which contains <pre> in the title.

This PR replaces those items with HTML entities, allowing them to properly render.