java: drop the old java code

This was never released, and real code updates haven't been done for
about 10 years.

At the time of this commit, we are only getting GitHub's reports about
security issues in vulnerable pom.xml dependencies, and random
dependabot pull-requests.

Author: praiskup

README

@@ -20,6 +20,4 @@ Overview of use:
 - it retrieves the results and saves them into the results dir
 - it returns the build status and where to find the results to the front end
 
-copr project is licensed under GPLv2+ (see LICENSE file for details),
-except for Java parts (contents of java directory) which are licensed
-under Apache License v2.0 (see java/LICENSE).
+copr project is licensed under GPLv2+ (see LICENSE file for details)