Early exit if pre-commit fails

[hmellor]

• Waits up to 10 minutes for pre-commit to complete
• If pre-commit failed, fail the build and exit early
• If pre-commit passed, continue with the build

Test builds:

• ✅ pre-commit failed on main but build should still proceed https://buildkite.com/vllm/ci/builds/58418/steps/canvas
• ✅ pre-commit failed on PR commit so build gets stopped https://buildkite.com/vllm/ci/builds/58419/steps/canvas
• ✅ pre-commit passed on PR commit so build proceeds https://buildkite.com/vllm/ci/builds/58420/steps/canvas