Add test run to CI and remove utils README

The CI workflow now includes a step to run tests with 'npm run test:run'. Also removed the empty README.md file from src/utils.

Author: Frederick-S

.github/workflows/node.js.yml

@@ -27,4 +27,5 @@ jobs:
         node-version: ${{ matrix.node-version }}
         cache: 'npm'
     - run: npm ci
+    - run: npm run test:run
     - run: npm run build --if-present