Rollup merge of #123879 - beetrees:missing-unsafe, r=Mark-Simulacrum

Add missing `unsafe` to some internal `std` functions

Adds `unsafe` to a few internal functions that have safety requirements but were previously not marked as `unsafe`. Specifically:

- `std::sys::pal::unix::thread::min_stack_size` needs to be `unsafe` as `__pthread_get_minstack` might dereference the passed pointer. All callers currently pass a valid initialised `libc::pthread_attr_t`.
- `std::thread::Thread::new` (and `new_inner`) need to be `unsafe` as it requires the passed thread name to be valid UTF-8, otherwise `Thread::name` will trigger undefined behaviour. I've taken the opportunity to split out the unnamed thread case into a separate `new_unnamed` function to make the safety requirement clearer. All callers meet the safety requirement now that #123505 has been merged.

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