rename service to spark

Author: dongjoon-hyun

.github/workflows/build_and_test.yml

@@ -58,7 +58,7 @@ jobs:
   integration-test:
     runs-on: ubuntu-latest
     services:
-      spark-connect-server:
+      spark:
         image: apache/spark:4.0.0-preview2
         ports:
           - 15002:15002