add bootstrap tests for detecting src and out

@jyn514

I was thinking about the following cases when I wrote the comment in #109055

Running bootstrap from the source root.
Running from a subdirectory of the source root.
Running from outside the source root.
Running on a different machine from where bootstrap was compiled (which will be important for no python in shell scripts #107812). You can mostly replicate this by renaming the source root so it no longer exists on disk.
Running with --build-dir.
Running with $RUST_BOOTSTRAP_CONFIG set in the environment and build-dir set in the file.

Originally posted by @jyn514 in #109055 (comment)

Rollup merge of rust-lang#109162 - ozkanonur:extend_detect_src_and_ou…

Auto merge of rust-lang#109162 - ozkanonur:extend_detect_src_and_out_…

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