Merge branch 'fix/use-dumux-add-test' into 'master'

Use dumux_add_test

See merge request !2633

(cherry picked from commit 9779114b)

87d1789a [handbook] Use dumux_add_test
37009b3a [test] Use dumux_add_test
4 jobs for !2635 with cherry-pick-9779114b
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