Auto merge of #124366 - Kobzol:remove-yaml-expansion, r=pietroalbini

CI: remove `expand-yaml-anchors`

This PR unifies all CI outcome jobs in a single job, and then removes the `expand-yaml-anchors` tool, since it is no longer needed after this change.

I have tested try builds for both situations with the new `outcome` job (note that these two workflow runs use a different step structure in the outcome job, I have simplified it since):
- [Success](https://github.com/rust-lang-ci/rust/actions/runs/8831529677/job/24251135366)
- [Failure](https://github.com/rust-lang-ci/rust/actions/runs/8833052319/job/24251628792)

r? `@ghost`