Consider removing dependency on LazyCell

[nox]

There is a slight risk of race condition with LazyCell because of its API design, it may be a good idea to replace its uses with OnceCell.

[dtolnay]

The race condition applies only to AtomicLazyCell, not the non-Sync LazyCell. AtomicLazyCell is not used by Cargo.

In any case, these days LazyCell is superseded by https://doc.rust-lang.org/1.73.0/std/cell/struct.OnceCell.html.

[epage]

#12616 at least removed our use of lazy_static for OnceCell. I think the lazy cell uses weren't as straightforward so they were skipped when doing that opportunistic refactor.