Update workflow to use yarn

Author: jonulak

.github/workflows/code-quality-score.yml

@@ -25,7 +25,7 @@ jobs:
           node-version: '20'
 
       - name: Install dependencies
-        run: npm ci
+        run: yarn install --frozen-lockfile
 
       - name: Run ESLint and generate report
         run: npx eslint src --ext .ts,.tsx -f json -o eslint-report.json || true