CI: add ubuntu2004 with tbb 2020 build

5 jobs for update-tbb-to-2020
Status Name Job ID Coverage
  External
passed cdash-buildbot

passed vtk-m-dragnipur-osx-shared-debug+32bit_ids+64bit_coords+clang+tbb

00:12:42

passed vtk-m-dragnipur-osx-static-release+64bit_coords+clang+tbb

00:19:26

passed vtk-m-osheim-windows-shared-debug+ninja-vs-2017+tbb

00:25:05

passed vtk-m-osheim-windows-static-release+ninja-vs-2017+tbb

00:33:29