fix: don't leave dangling job in mr

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

includes/tests/unit.yml

@@ -6,6 +6,8 @@ test:unit:
     - unit
   stage: tests
   rules:
+    - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
+      when: never
     - if: $IS_NPM_LIBRARY
       when: never
     - if: $CI_COMMIT_BRANCH == "devel"