Auto merge of #139720 - petrochenkov:errkind2, r=jieyouxu

compiletest: Make diagnostic kind mandatory on line annotations (take 2)

Compiletest currently accepts line annotations without kind in UI tests.
```
    let a = b + c; //~ my message
```

Such annotations have two effects.
- First, they match any compiler-produced diagnostic kind. This functionality is never used in practice, there are no target-dependent diagnostic kinds of something like that.
- Second, they are not "viral". For example, any explicit `//~ NOTE my msg` in a test requires all other `NOTE` diagnostics in the same test to be annotated. Implicit `//~ my msg` will just match the note and won't require other annotations.

The second functionality has a replacement since recently - directive `//@ dont-require-annotations: NOTE`.

This PR removes support for `//~ my message` and makes the explicit diagnostic kind mandatory.
Unwanted additional annotations are suppressed using the `dont-require-annotations` directive.

Closes https://github.com/rust-lang/compiler-team/issues/862.
Previous attempt - #139427.
r? `@jieyouxu`

0 files changed, 0 insertions, 0 deletions