Fix pretty-printing of `$crate` (take 4)
Pretty-print `$crate` as `crate` or `crate_name` in unstructured tokens like `a $crate c` in `foo!(a $crate c)`, but only if those tokens are printed as a part of AST pretty-printing, rather than as a standalone token stream.
Fixes https://github.com/rust-lang/rust/issues/62325
Previous iterations - https://github.com/rust-lang/rust/pull/56647, https://github.com/rust-lang/rust/pull/57155, https://github.com/rust-lang/rust/pull/57915.