chore: deny all clippy lints on turborepo clippy run (#6186)
### Description
This makes clippy warnings blocking for any crate that's a member of the
`turborepo` cargo group.
### Testing Instructions
At the time of writing main has clippy warnings and this should fail. If
https://github.com/vercel/turbo/pull/6185 gets merged and this PR gets
rebased, then there won't be any warnings to error out on.
Co-authored-by: Chris Olszewski <Chris Olszewski>
