[BOOK-498] fix: 테스트용 구글 client-id가 없어서 CI 깨지는 문제 해결

Author: move-hoon

apis/src/main/resources/application.yml

@@ -96,3 +96,4 @@ oauth:
   google:
     url:
       user-info: https://www.googleapis.com/oauth2/v2/userinfo
+    client-id: test-client-id