PLANNER-585: Workbench: Consolidate test names

[mcimbora]

As #75 already uses naming convention without "test" pre/suffixes that we agreed on with @ge0ffrey , this PR fixes that optaplanner-wb - wide.

@manstis What about the other projects (e.g. drools-wb), is there any will to update the names as well?

[manstis]

@mcimbora I have zero intention of renaming old tests.

[ge0ffrey]

+1

@manstis if you do ever want to do it, we got a regex to do all of them safely in less than a minute. But I understand that this isn't important.