Infinite loop in vtkm/cont/testing CMakeLists.txt

I'm building WarpX against an Ascent build with VTK-m.

AMReX links libraries in the following way: https://github.com/AMReX-Codes/amrex/blob/development/Tools/CMake/AMReXTargetHelpers.cmake#L91

The issue is it gets caught in an infinite loop in VTK-m due to this circular linking: https://gitlab.kitware.com/vtk/vtk-m/-/blob/master/vtkm/cont/testing/CMakeLists.txt#L122

Hacky workaround: Comment out Line 122 and disable tests in VTK-h and Ascent.