[JENKINS-27026] - Update SSHD Module from 2.0 to 2.3 

[JENKINS-20474] Optimize away ACL construction and AuthorizationStrategy calls when checking permissions for SYSTEM

GMaven cleanup

surefire.skipAfterFailureCount=100

Deleting GroovyTest, which only tested the ability to write Jenkins tests in Groovy, not Jenkins itself.

Deleting ancient cobertura profile, which was broken at least by Java 8 if not earlier. If we want code coverage we can use JaCoCo as plugin-pom does.

[JENKINS-20474] Optimize away ACL construction and AuthorizationStrategy calls when checking permissions for SYSTEM.

Translate into Simplified Chinese with creating new properties file

Only inspect direct subdirectories for Surefire reports