Rollup merge of #142666 - jieyouxu:skip-triagebot-check, r=Kobzol

Skip tidy triagebot linkcheck if `triagebot.toml` doesn't exist

Since distribution tarballs won't include `triagebot.toml`.

I think it's sufficiently obvious if `triagebot.toml` gets deleted entirely in PRs.

r? Kobzol

Author: Kobzol