Further improve settings for extra tests from GitLab

tests/lakedrops.yml

@@ -31,6 +31,9 @@ Test Code Style:
     when: always
     paths:
       - phpcs.xml
+  rules:
+    - if: '$DISABLE_CI_TEST_CODESTYLE == "1"'
+      when: never
 
 Test PHPUnit:
   <<: *test_lakedrops_default