Auto merge of #146595 - Shourya742:make-cargo-test-work-for-self-test, r=Kobzol

Make cargo test work for  bootstrap self test

This PR enables the bootstrap self-test to run via cargo test. I have removed the detect_src_and_out test for now, but it will be reintroduced in a follow-up PR where all bootstrap tests will be migrated to use testCtx.

r? `@Kobzol`

try-job: aarch64-apple

Author: bors