Build: review build to be more reliable/portable

This PR does a few things:

in case of a gradle vendor failure halts the build https://github.com/elastic/logstash/issues/12869
cleaned up Java dependencies - plugin did not really depend on everything listed
aligned running Java/Ruby test using rake test ... depends on: https://github.com/elastic/logstash-devutils/pull/96 https://github.com/logstash-plugins/.ci/pull/36

logstash-plugins / logstash-filter-date