Automatic merge from submit-queue E2E & Node E2E: Move configmap, docker_containers, downward_api, expansion and secrets test into common directory. This is the 3rd part of #29494. For #29081. Based on #29092, #29806. The first commit is squash of all dependent commits. Please only review the second commit. The second PR added 17 lines. @vishh @timstclair