Auto merge of #14177 - eth3lbert:snapbox-rust, r=weihanglo

test: migrate rust_version and rustc* to snapbox

### What does this PR try to resolve?

Part of #14039.

Migrate following to snapbox:

- `tests/testsuite/rust_version.rs`
- `tests/testsuite/rustc.rs`
- `tests/testsuite/rustc_info_cache.rs`

Author: bors