[beta] Clippy backports

[flip1995]

r? @Mark-Simulacrum

Backports:

• https://github.com/rust-lang/rust-clippy/pull/13553
• https://github.com/rust-lang/rust-clippy/pull/13600

The first is just a regrouping to a allow-by-default group, as we figured that the lint would be too noisy as a warn-by-default lint. That lint was added last release cycle, so we want to do the re-grouping before it hits stable.

The second is a bug fix for &raw references that are already stable in 1.82, but we don't want to wait another release cycle for the fix to land on stable.

Both commits are already synced to the current master branch.

[rustbot]

:warning: Warning :warning:

• Pull requests are usually filed against the master branch for this repo, but this one is against beta. Please double check that you specified the right target!

[rustbot]

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy