Auto merge of #135048 - cuviper:beta-next, r=cuviper

[beta] backports

- Do not call `extern_crate` on current trait on crate mismatch errors #133585
- Correctly handle comments in attributes in doctests source code #134260
- Correctly document CTFE behavior of is_null and methods that call is_null. #134325
- Make sure we handle `backwards_incompatible_lint` drops appropriately in drop elaboration #134486
- Bump compiler `cc` to 1.2.5 #134505
- Handle `DropKind::ForLint` in coroutines correctly #134575
- docs: inline `std::ffi::c_str` types to `std::ffi` #134791
- docs: inline `alloc::ffi::c_str` types to `alloc::ffi` #134851

r? cuviper