TEST: Remove duplicated test case regardless ZK is running or not.

Author: brido4125

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
 
       - name: Build ARCUS Client
         run: mvn install -DskipTests
-      - name: Test ARCUS Client -DUSE_ZK=false -DARCUS_HOST=127.0.0.1:11212
-        run: mvn test -DUSE_ZK=false -DARCUS_HOST=127.0.0.1:11212
-      - name: Test ARCUS Client -DUSE_ZK=true
+      - name: Test ARCUS Client Without ZK
+        run: mvn test -DUSE_ZK=false -Dtest=ObserverTest
+      - name: Test ARCUS Client With ZK
         run: mvn test -DUSE_ZK=true