Add ESLint for Github Action (#125)

* Fix Backend CI checks

* Update backend cicd workflow

* Install ESlint in github action

.github/workflows/backend-ci-workflow.yaml

@@ -44,6 +44,8 @@ jobs:
       # Lint Check for Each Service
       - name: Lint Each Service
         run: |
+          npm install -g eslint
+
           services=("auth-service" "code-execution-service" "collaboration-service" "gateway-service" "matching-service" "question-service" "user-service" "y-websocket-service")
           for service in "${services[@]}"; do
             echo "Linting $service"