Implements a script to test all supported plugins against Logstash/JRuby, in particular it uses the JRuby(and JDK) bundled with Logstash to execute the unit tests, create the gem and install the gem on local Logstash.
This doesn't start a real pipeline run into the local Logstash, but should be enough to reveal macroscopic Ruby syntax compatibility errors.
Refer to PR https://github.com/elastic/logstash/pull/15018 for usage examples.
Co-authored-by: Ry Biesemeyer <yaauie@users.noreply.github.com>
