Simplify CMake test infrastructure

Lars Bilkerequested to merge
bilke/ogs:simplify-tests into master
  • Removed MeshTest(), is replaced by regular AddTest() with new TESTER vtkdiff-mesh
  • Added placeholder <PATH>, <SOURCE_PATH> and <BUILD_PATH> in AddTest() to simplify path setups
  • Removed unused wrappers memcheck and callgrind in AddTest()
  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
Edited by Lars Bilke

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