Auto merge of #102610 - dawnofmidnight:git-commit-hash, r=Mark-Simulacrum

re-add git-commit-hash file to tarballs

rust-lang/rust#100557 removed the `git-commit-hash` file and replaced it with `git-commit-info`. However, build-manifest relies on the `git-commit-hash` file being present, so this adds it back.

r? `@Mark-Simulacrum`

Author: bors