syncpack was failing without logs

originally, the intent behind using syncpack was to make sure our dependencies were compatible. but it's been failing on all of our PRs without any logs, and it's difficult to recreate locally (example): https://github.com/googleapis/google-cloud-node-core/actions/runs/22781070422/job/66086734223?pr=920

I think right now it's doing more harm than good but so I'm going to delete it. but, i still think we should come up with some replacement to make sure our dependencies are in sync.