chore: fix clippy lints in tests (#6384)
### Description
Fix some clippy lints in our tests that have been bothering me for a
bit.
These aren't caught by CI since we're not enabling the `test` feature
and I would much rather have clippy check production codepath as opposed
to the test codepath. There does exists a `--tests` option for `clippy`,
but we'd need to teach `cargo-groups` how to properly forward it.
### Testing Instructions
👀
Closes TURBO-1600
Co-authored-by: Chris Olszewski <Chris Olszewski>
