A followup to JDK-8355773. Convert a bunch more tests to fetch the ThreadReference from a static field in the debuggee. JDK-8355773 focused on the easier tests that already had a static field, and the name of the field was the same as the thread name. This batch takes care of a bunch of harder to convert tests where in many cases static field has to be added and usually does not have the same name as the thread name.