[SPARK-50805][CORE] Move method nameForAppAndAttempt to o.a.s.u.Utils

### What changes were proposed in this pull request?

Pure refactor, move method `nameForAppAndAttempt` from `EventLogFileWriter` to `o.a.s.u.Utils`.

### Why are the changes needed?

The method could be reused in several other places, e.g. #49440

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

Pass GHA.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #49476 from pan3793/SPARK-50805.

Authored-by: Cheng Pan <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: pan3793

core/src/main/scala/org/apache/spark/deploy/history/EventLogFileWriters.scala

@@ -187,12 +187,7 @@ object EventLogFileWriter {
   }
 
   def nameForAppAndAttempt(appId: String, appAttemptId: Option[String]): String = {
-    val base = Utils.sanitizeDirName(appId)
-    if (appAttemptId.isDefined) {
-      base + "_" + Utils.sanitizeDirName(appAttemptId.get)
-    } else {
-      base
-    }
+    Utils.nameForAppAndAttempt(appId, appAttemptId)
   }
 
   def codecName(log: Path): Option[String] = {

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

@@ -2954,6 +2954,15 @@ private[spark] object Utils
     str.replaceAll("[ :/]", "-").replaceAll("[.${}'\"]", "_").toLowerCase(Locale.ROOT)
   }
 
+  def nameForAppAndAttempt(appId: String, appAttemptId: Option[String]): String = {
+    val base = sanitizeDirName(appId)
+    if (appAttemptId.isDefined) {
+      base + "_" + sanitizeDirName(appAttemptId.get)
+    } else {
+      base
+    }
+  }
+
   def isClientMode(conf: SparkConf): Boolean = {
     "client".equals(conf.get(SparkLauncher.DEPLOY_MODE, "client"))
   }