Use recommended configurations in Jenkinsfile
Use recommended configurations in Jenkinsfile

Currently this includes testing with Java 8 & 11 on the latest Jenkins LTS,
therefore more combinations are tested.

These configurations will be changed over time to make sure a plugin is
working fine for relevant setups.

More details can be found at:
https://github.com/jenkins-infra/pipeline-library/blob/master/README.adoc

jenkinsci/extra-tool-installers-plugin,jenkinsci/extra-tool-installers-plugin