Merge pull request #18268 from soltysh/issue18261

Automatic merge from submit-queue (batch tested with PRs 18415, 18419, 18268, 18102, 18440).

UPSTREAM: 58753: Fix kubectl explain for cronjobs

Fixes #18261.

@Kargakis fyi
/assign @juanvallejo

Author: openshift-merge-robot

test/cmd/explain.sh

@@ -23,6 +23,8 @@ os::cmd::expect_success 'oc explain bc'
 os::cmd::expect_success 'oc explain image'
 os::cmd::expect_success 'oc explain is'
 
+os::cmd::expect_success 'oc explain cronjob'
+
 echo "explain: ok"
 os::test::junit::declare_suite_end