Fix excludedGroups input for maven-surefire plugin. (#2226)

Author: Rudra-Gujarathi

pom.xml

@@ -698,7 +698,7 @@
                 <exclude>**/KafkaToKafkaIT.java</exclude>
               </excludes>
               <excludedGroups>
-                ${direct-runner.tests}
+                ${direct-runner.tests},
                 com.google.cloud.teleport.metadata.SkipRunnerV2Test
               </excludedGroups>
               <groups>