Rollup merge of #139489 - petrochenkov:noreqann, r=jieyouxu

compiletest: Add directive `dont-require-annotations`

for making matching on specific diagnostic kinds non-exhaustive.

E.g. `//@ dont-require-annotations:ERROR`, like in the examples in this PR.

cc rust-lang/rust#139427 (comment)

Closes #132647 FYI `@BoxyUwU` since you've wanted this.

r? `@jieyouxu`

Author: matthiaskrgr