[SPARK-46498][CORE] Remove shuffleServiceEnabled from `o.a.spark.ut…

…il.Utils#getConfiguredLocalDirs`

### What changes were proposed in this pull request?
This PR cleans up an unused local variables from `org.apache.spark.util.Utils#getConfiguredLocalDirs` function, It is no longer used after the support for Mesos was removed in SPARK-44442 (#43135).

### Why are the changes needed?
Code clean up

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Pass GitHub Actions

### Was this patch authored or co-authored using generative AI tooling?
No

Closes #44475 from LuciferYang/utils-useless.

Lead-authored-by: yangjie01 <yangjie01@baidu.com>
Co-authored-by: YangJie <yangjie01@baidu.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

core/src/main/scala/org/apache/spark/util/Utils.scala

@@ -67,7 +67,7 @@ import org.slf4j.Logger
 
 import org.apache.spark._
 import org.apache.spark.deploy.SparkHadoopUtil
-import org.apache.spark.internal.{config, Logging}
+import org.apache.spark.internal.Logging
 import org.apache.spark.internal.config._
 import org.apache.spark.internal.config.Streaming._
 import org.apache.spark.internal.config.Tests.IS_TESTING
@@ -769,7 +769,6 @@ private[spark] object Utils
    * logic of locating the local directories according to deployment mode.
    */
   def getConfiguredLocalDirs(conf: SparkConf): Array[String] = {
-    val shuffleServiceEnabled = conf.get(config.SHUFFLE_SERVICE_ENABLED)
     if (isRunningInYarnContainer(conf)) {
       // If we are in yarn mode, systems can have different disk layouts so we must set it
       // to what Yarn on this system said was available. Note this assumes that Yarn has