Move even more early buffered lints to dyn lint diagnostics Follow-up to https://github.com/rust-lang/rust/pull/145881 and https://github.com/rust-lang/rust/pull/145747. I originally wanted to migrate most if not the entire rest of the early buffered lints. However, when trying to migrate the buffered lints used by check-cfg I encountered a roadblock. Namely, it depends on `TyCtxt` (well, `Option<TyCtxt>`) which makes it quite hard to migrate (see also https://github.com/rust-lang/rust/pull/147634#issuecomment-3398174584, https://github.com/rust-lang/rust/pull/147634#issuecomment-3398207128 & rust-lang/rust#149215). So for now, I won't migrate it (maybe rust-lang/rust#149215 will find a solution), nor will I migrate the rest since it's quite tedious to migrate these. I'll leave them for future me.