Merge pull request #18967 from gabemontero/jenkins-multinamespace-test

Automatic merge from submit-queue.

client plugin multinamespace test part 1: create template in repo tha…

…t the pipeline can use

@openshift/sig-developer-experience ptal

once we can access this template in the pipeline job via `oc create -f https://....`, I'll submit a PR that introduces an extended test that provides a jenkins pipeline that leverages this template

Author: openshift-merge-robot