#move-VTKExtensions-Testing-tests

VTKExtensions/Testing directory included several tests that were not been executed.
This was a result of a refactoring process. The majority of the tests are now moved
to their appropriate folder. Tests related to `vtkIceTCompositePass` have been deactivated
because they need to be heavily updated due to major API changes. Tests that were deemed
unnecessary were deleted.
