Rollup merge of #121560 - Noratrieb:stop-lint-macro-nonsense, r=jieyouxu

Allow `#[deny]` inside `#[forbid]` as a no-op

Forbid cannot be overriden. When someome tries to do this anyways, it results in a hard error. That makes sense.

Except it doesn't, because macros. Macros may reasonably use `#[deny]` (or `#[warn]` for an allow-by-default lint) in their expansion to assert that their expanded code follows the lint. This is doesn't work when the output gets expanded into a `forbid()` context. This is pretty silly, since both the macros and the code agree on the lint!

By making it a warning instead, we remove the problem with the macro, which is now nothing as warnings are suppressed in macro expanded code, while still telling users that something is up.

fixes #121483

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