Rollup merge of #143177 - xizheyin:143134, r=lcnr

Remove false label when `self` resolve failure does not relate to macro

Fixes rust-lang/rust#143134

In the first commit, I did some code-clean, moving `suggest*` to `suggestions/` dir.
In the second, commit, I added ui test.
In the third, I change the code, and present the test result.

r? compiler

Author: tgross35