Rollup merge of #129942 - onur-ozkan:building-rustc-tools, r=Kobzol

copy rustc rustlib artifacts from ci-rustc

We recently (since rust-lang/rust#129311) had an issue because some rustlib files were missing (like: "error[E0463]: can't find crate for rustc_ast") when building tools that rely on rustc. This patch fixes that by copying those files as required.

r? Kobzol

Blocker for rust-lang/rust#122709

Author: matthiaskrgr