Drop the RTestSuite it hasn't passed for weeks

Author: holdenk

resource-managers/kubernetes/integration-tests/src/test/scala/org/apache/spark/deploy/k8s/integrationtest/KubernetesSuite.scala

@@ -44,7 +44,7 @@ import org.apache.spark.internal.config._
 class KubernetesSuite extends SparkFunSuite
   with BeforeAndAfterAll with BeforeAndAfter with BasicTestsSuite with SparkConfPropagateSuite
   with SecretsTestsSuite with PythonTestsSuite with ClientModeTestsSuite with PodTemplateSuite
-  with PVTestsSuite with DepsTestsSuite with DecommissionSuite with RTestsSuite with Logging
+  with PVTestsSuite with DepsTestsSuite with DecommissionSuite with Logging
   with Eventually with Matchers {