Reverting https://github.com/jenkinsci/jenkins-test-harness/pull/838#discussion_r1765579500 as it seems to cause a regression I do not understand in hudson.PluginManagerTest.uberClassLoaderIsAvailableDuringStart. The nature of the rootDir parameter passed reflectively is undocumented generally, but LocalPluginManager expects it to be $JENKINS_HOME not $JENKINS_HOME/plugins.
Reverting https://github.com/jenkinsci/jenkins-test-harness/pull/838#discussion_r1765579500 as it seems to cause a regression I do not understand in
hudson.PluginManagerTest.uberClassLoaderIsAvailableDuringStart. The nature of therootDirparameter passed reflectively is undocumented generally, butLocalPluginManagerexpects it to be$JENKINS_HOMEnot$JENKINS_HOME/plugins.