Summary: This uses the convenience methods from `k8s.io/client-go` and removes some of our code dupe.

Test Plan: skaffold

Reviewers: michelle, philkuz

Reviewed By: philkuz

Differential Revision: https://phab.corp.pixielabs.ai/D9625

GitOrigin-RevId: 46f5dd45927f3b4000e80a3c10c4d908c81a3286