Update checkstyle's regression configuration

We need to update checkstyle's standard regression configuration as it may not be testing everything.
See https://github.com/checkstyle/checkstyle/issues/3656 .

We should add a new mode that builds a configuration file on all modules, not just ones that changed in git.
It needs to make a distinction between Normal modules + Java modules and Javadoc modules because Javadocs are slower.

These are the files that need to be updated:
https://github.com/checkstyle/contribution/blob/master/checkstyle-tester/checks-nonjavadoc-error.xml
https://github.com/checkstyle/contribution/blob/master/checkstyle-tester/checks-only-javadoc-error.xml

This is blocked by https://github.com/checkstyle/regression-tool/issues/5 .