MultiJob Jenkins plugin is deprecated

[targos]

https://github.com/jenkinsci/tikal-multijob-plugin

Deprecation Note

This plugin was very popular for many years, but since most of Jenkins usage now is based on Jenkins Pipeline, and the 'parallel' step along with 'BlueOcean' can basically do whatever this plugin does, it is no longer in Tikal's radar. Also, we published the parallelPhase library class that can do in pipelines what the plugin does.