Revert "workaround for SPARK-49249"

This reverts commit 4fa5c1d.

Author: pan3793

kyuubi-server/src/test/scala/org/apache/kyuubi/operation/KyuubiOperationPerGroupSuite.scala

@@ -32,8 +32,6 @@ class KyuubiOperationPerGroupSuite extends WithKyuubiServer with SparkQueryTests
     .set("hadoop.user.group.static.mapping.overrides", s"user1=testGG,group_tt;user2=testGG")
     .set(s"hadoop.proxyuser.$user.groups", "*")
     .set(s"hadoop.proxyuser.$user.hosts", "*")
-    // TODO adapt to SPARK-49249 in Scala mode
-    .set("spark.sql.artifact.isolation.enabled", "false")
 
   override def beforeAll(): Unit = {
     UserGroupInformation.createUserForTesting("user1", Array("testGG", "group_tt"))

kyuubi-server/src/test/scala/org/apache/kyuubi/operation/KyuubiOperationPerServerSuite.scala

@@ -24,8 +24,7 @@ class KyuubiOperationPerServerSuite extends WithKyuubiServer with SparkQueryTest
 
   override protected def jdbcUrl: String = getJdbcUrl
 
-  override protected val conf: KyuubiConf = KyuubiConf()
-    .set(KyuubiConf.ENGINE_SHARE_LEVEL, "server")
-    // TODO adapt to SPARK-49249 in Scala mode
-    .set("spark.sql.artifact.isolation.enabled", "false")
+  override protected val conf: KyuubiConf = {
+    KyuubiConf().set(KyuubiConf.ENGINE_SHARE_LEVEL, "server")
+  }
 }

kyuubi-server/src/test/scala/org/apache/kyuubi/operation/KyuubiOperationPerUserSuite.scala

@@ -38,10 +38,9 @@ class KyuubiOperationPerUserSuite
 
   override protected def jdbcUrl: String = getJdbcUrl
 
-  override protected val conf: KyuubiConf = KyuubiConf()
-    .set(KyuubiConf.ENGINE_SHARE_LEVEL, "user")
-    // TODO adapt to SPARK-49249 in Scala mode
-    .set("spark.sql.artifact.isolation.enabled", "false")
+  override protected val conf: KyuubiConf = {
+    KyuubiConf().set(KyuubiConf.ENGINE_SHARE_LEVEL, "user")
+  }
 
   override def beforeAll(): Unit = {
     super.beforeAll()