[compiler-rt] [compiler-rt][rtsan] Introduce first end to end RTsan lit tests, enable instrumented unit tests (PR #105732)

[Chris Apple via llvm-commits]

cjappl wrote:

(trying some new reviewers I saw were on the codeowners group for compiler-rt sanitizers, just let me know if you would not like to be requested in the future!)

https://github.com/llvm/llvm-project/pull/105732