Automatic merge from submit-queue (batch tested with PRs 45990, 45544, 45745, 45742, 45678)

Add integration test for deployment

We have no integration test for Deployment currently. In this PR, add an integration test which covers an e2e test (create a new RollingUpdate deployment), add more replicas to the Deployment, and set minReadySeconds so that we can test maxUnavailable. 

Plan to add more integration tests that cover e2e tests after this initial PR is merged.

@kubernetes/sig-apps-pr-reviews