Make test use offscreen rendering.

Making the test a little more robust to random failures
29 jobs for 20102-view-sizes-and-traces
Status Name Job ID Coverage
  External
passed cdash-buildbot

passed cdash-commit

passed ghostflow-branch-check-master

pending paraview@master-dres-osx-shared-release+gui+python3
passed paraview@master-luigi-linux-shared-release+gui+mpi+python3

failed paraview@master-nemesis-windows-shared-release+gui+kits+mpi+python3

passed paraview@master-nemesis-windows-shared-release+gui+mpi

passed paraview@master-taanab-linux-shared-release+adios2+icc+mpi+python3

passed paraview@master-taanab-linux-static-release+adios2+mpi+offscreen+osmesa+python3

failed paraview@master-tylo-windows-shared-release+gui+python3+qtmin+tbb

passed paraview@master-tylo-windows-shared-release+gui+python3+tbb

passed paraview@master-vall-linux-shared-debug+adios2+extdeps+gui+mpi+python3

passed cdash-buildbot

passed paraview@master-luigi-linux-shared-release+gui+mpi+python3

01:23:56

passed paraview@master-luigi-linux-shared-release+gui+mpi+python3

failed paraview@master-nemesis-windows-shared-release+gui+kits+mpi+python3

01:38:47

failed paraview@master-nemesis-windows-shared-release+gui+kits+mpi+python3

passed paraview@master-nemesis-windows-shared-release+gui+mpi

passed paraview@master-nemesis-windows-shared-release+gui+mpi

01:20:06

passed paraview@master-taanab-linux-shared-release+adios2+icc+mpi+python3

passed paraview@master-taanab-linux-shared-release+adios2+icc+mpi+python3

00:52:01

passed paraview@master-taanab-linux-static-release+adios2+mpi+offscreen+osmesa+python3

00:43:33

passed paraview@master-taanab-linux-static-release+adios2+mpi+offscreen+osmesa+python3

failed paraview@master-tylo-windows-shared-release+gui+python3+qtmin+tbb

00:02:47

failed paraview@master-tylo-windows-shared-release+gui+python3+qtmin+tbb

passed paraview@master-tylo-windows-shared-release+gui+python3+tbb

01:25:36

passed paraview@master-tylo-windows-shared-release+gui+python3+tbb

passed paraview@master-vall-linux-shared-debug+adios2+extdeps+gui+mpi+python3

01:26:30

passed paraview@master-vall-linux-shared-debug+adios2+extdeps+gui+mpi+python3