don't run cargo fmt --all in pre-commit hook (vercel#3403)

This action started failing because `cargo fmt` was added to the
pre-commit hook and the tool is not available without running Rust
setup. Instead, we should just skip applying hooks when creating commits
from this workflow.

~Since the create-pull-request doesn't have a way of disabling hooks,
simply remove the file before husky installs it into place.~ Let `cargo
fmt` run on individual files through lint-staged, but don't run it on
everything on every precommit.

Test Plan: Manual workflow run on this branch which opened vercel#3401

.husky/pre-commit

@@ -2,4 +2,3 @@
 . "$(dirname -- "$0")/_/husky.sh"
 
 pnpm exec lint-staged
-cargo fmt --all