Automatic merge from submit-queue (batch tested with PRs 51391, 51338, 51340, 50773, 49599)
Remove duplicate code
This PR cleans up Kubelet test code. Adds a function enabling the removal of duplicate code for Mock chaining. Also adds a function to check the pod status, again enabling removal of duplicate code.
Fixes#22470
**Special notes for your reviewer**:
This is my first PR for the Kubernetes project. Keeping it simple.