oc explain tests have to be enabled to ensure openapi/v3 is working properly

The tests have been temporarily disabled in order to unblock the oc kube bump (https://github.com/openshift/oc/pull/1420). 

The following efforts need to be done/merged to make openapi/v3 work:

- [DONE] oauth-apiserver kube bump: https://github.com/openshift/oauth-apiserver/pull/89
- [DONE] merge kubectl fix backport https://github.com/kubernetes/kubernetes/pull/118930 and bump kube dependency in oc to include this fix (https://github.com/openshift/oc/pull/1515)
- [DONE] merge https://github.com/kubernetes/kubernetes/pull/118881 and carry this PR in our kube-apiserver to stop oc explain being flaky (https://github.com/openshift/kubernetes/pull/1629)
- [DONE] merge https://github.com/kubernetes/kubernetes/pull/118879 and carry this PR in our kube-apiserver to enable apiservices (https://github.com/openshift/kubernetes/pull/1630)
- [DONE] make openapi/v3 work for our special groups https://github.com/openshift/kubernetes/pull/1654 (https://github.com/openshift/kubernetes/pull/1617#issuecomment-1609864043, slack discussion: https://redhat-internal.slack.com/archives/CC3CZCQHM/p1687882255536949?thread_ts=1687822265.954799&cid=CC3CZCQHM)
- [DONE] enable back oc explain tests: https://github.com/openshift/origin/pull/28155 and bring in new tests: https://github.com/openshift/origin/pull/28129
- [OPTIONAL] bring in additional upstream kubectl/oc explain tests: https://github.com/kubernetes/kubernetes/pull/118885
- [OPTIONAL] backport https://github.com/kubernetes/kubernetes/pull/119839 and https://github.com/kubernetes/kubernetes/pull/119841 (backport of https://github.com/kubernetes/kubernetes/pull/118881 and https://github.com/kubernetes/kubernetes/pull/118879)

1.
2.
3.