Rollup merge of #104339 - compiler-errors:rustc_deny_explicit_impl, r=cjgillot

Add `rustc_deny_explicit_impl`

Also adjust `E0322` error message to be more general, since it's used for `DiscriminantKind` and `Pointee` as well.

Also add `rustc_deny_explicit_impl` on the `Tuple` and `Destruct` marker traits.

diff --cc compiler/rustc_feature/src/builtin_attrs.rs
Simple merge

diff --cc compiler/rustc_span/src/symbol.rs
Simple merge