Migrate compiler ui test harness from `compiletest` to `trybuild`

[bdbai]

compiletest_rs seems always failing in my environment. Specifically, it complains about spaces in my PATH env and always panics without a reasonable error message. Given all the issues listed here, I would suggest simply migrate to trybuild to avoid all these problems related to compiletest_rs.

A miri test pass is also added to ensure UBs in tests could be caught earlier as much as possible.