Dependency Tree Input Builder/check github action does not account for testbom

As part of work on WFLY-14431 we added a new testbom bom and added it to dependencyManagement for a few modules as an import scope dependency.

But this is leading to failures in the Dependency Tree Input Builder/check github action, e.g. https://github.com/wildfly/wildfly-core/pull/4590/checks?check_run_id=2588583680. I believe this is because the "Build base" step in the action is not building testbom, so the subsequent "Grab base dependencies" step fails because the testbom pom is not available in the maven repository.