using yarn instead of npm

Author: mareknovotny

.github/workflows/coverage_report.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/setup-node@v4
         with:          
           node-version: 20
-      - run: npm ci
+      - run: yarn install --frozen-lockfile        
       - run: npm run test:report
       - run: sonar-scanner
           -Dsonar.organization=kiegroup