Get rid of release version strings in testsuite pom file comments

The testsuite/integration legacy, rbac and smoke poms all have a comment line like this:

-Djboss.home=${workspace_loc:wildfly-build}/target/wildfly-27.0.0.Alpha5-SNAPSHOT

Either drop that entire comment (my preference; it's better covered in docs, not comments in random poms) or change the string to use something like <current_version> instead of an actual version.

Reason for this is to stop the updating of that string every time we release so the updates are focused solely on the actual pom version elements.