ci: Require tests to pass only on Linux

FreeBSD CI is unstable and we lack people who have relevant knowledge
about FreeBSD to debug and address the issue.


(cherry picked from commit 354d4f78c6)

Co-authored-by: Vlad Zahorodnii <vlad.zahorodnii@kde.org>

.kde-ci.yml

@@ -46,4 +46,4 @@ RuntimeDependencies:
 Options:
   ctest-arguments: '--repeat until-pass:5'
   use-ccache: True
-  require-passing-tests-on: ['FreeBSD', 'Linux']
+  require-passing-tests-on: ['Linux']