fix: disable linting for npm libraries

The linting process is not relevant for npm libraries, as they typically
do not contain PHP code. Disabling linting for these libraries reduces
unnecessary processing and improves the efficiency of the CI pipeline.

includes/tests/lint.yml

@@ -14,6 +14,9 @@ lint:
   parallel:
     matrix:
       - PHP_IMAGE: ["8.4.1", "7.4.1"]
+  rules:
+    - if: $IS_NPM_LIBRARY
+      when: never
   artifacts:
     paths:
       - lint-codequality.json