[cmake][python][bugfix] Fix dune_python_add_test after !1130

• The argument WORKING_DIRECTORY has been accidentally removed in !1130 (merged). This causes the argument being parsed as one of the MULTI argmuents if following one of these and can break the dune_add_test call.
• The way CMAKE_GUARD is handled doesn't cover the usage described in the dune_add_test docs
• Add missing documentation for newly parsed arguments

added bugfix label

assigned to @tkoch

added 1 commit

• 41c3dcf1 - [cmake][python][bugfix] Revert starting to parse CMAKE_GUARD in dune_python_add_test

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added 1 commit

• ae3dc1b1 - [cmake][python][doc] Document all parameters of dune_add_python_test

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mentioned in merge request !1130 (merged)

requested review from @samuel.burbulla

changed milestone to %DUNE 2.9.0

changed the description

added python label

added buildsystem label

marked this merge request as ready

Thanks for pointing out and directly fixing the issues!

merged

mentioned in commit 7b9ec5fd