Windup 102: Refactor java legacy rules

The only thing I need to discuss is java-gate that is present twice and I didnt migrate it till now.
For example here: https://github.com/windup/windup-legacy/blob/master/application/rules/src/main/resources/windup/java/java-weblogic-config.windup.xml
If that's just some prefilter, what is conclusion for us then? We could just ignore it and it would work the same without any file-gate in the windup 2.x.