Add Testing Macro to start tests through bender launcher

Consequently modifying the Libs/VTK/Filters/Sources test accordingly.

See Issue #13852
Adapt Widget tests to new launcher

See Issue #13852
Merge branch '13852-Testing-JA' into armatures

* 13852-Testing-JA:
  Adapt Widget tests to new launcher
  Add Testing Macro to start tests through bender launcher