Rollup merge of #98660 - eddyb:invalid-punct-stage1, r=lqd

Rollup merge of #98660 - eddyb:invalid-punct-stage1, r=lqd

Unbreak stage1 tests via ignore-stage1 in `proc-macro/invalid-punct-ident-1.rs`.

#98188 broke `./x.py test --stage 1` (which I thought we ran in PR CI, cc `@rust-lang/infra)` i.e. the default `./x.py test` in dev checkouts, as the panic in `src/test/ui/proc-macro/invalid-punct-ident-1.rs` moved from the server (`rustc`) to the client (proc macro), and that means it's now affected by #59998.

I made the test look like `src/test/ui-fulldeps/issue-76270-panic-in-libproc-macro.rs` tho I'm a bit confused why that one is in `src/test/ui-fulldeps`, it should still work in `src/test/ui`, no? (cc `@Aaron1011)`