Merge branch 'feature/cmake-test-drop-dune26' into 'master'

Feature/cmake test drop dune26

See merge request !2375

(cherry picked from commit 4a6fd126)

f0b9e99e [cmake][test] Forward to dune_add_test and add function evaluating test guards
64af647a [example] Fixup liddrivencavity test cmake skip
c58be6a0 [doc][cmake] Improve dumux_evaluate_cmake_guard doc