MINOR: Delete temporary directories after using them in RaftManagerTest Updated (#20550)

Follow-up to [#11193](https://github.com/apache/kafka/pull/11193). This
change adds cleanup of the temporary log and metadata directories
created by RaftManagerTest so they are removed after each test run.
Without this cleanup, the directories remain until the entire test suite
completes, leaving extra files in the system temporary directory.

Testing:
- Ran `./gradlew core:test --tests kafka.raft.RaftManagerTest` and
confirmed all tests pass.

Reviewers: TengYao Chi <kitingiao@gmail.com>, Chia-Ping Tsai
 <chia7712@gmail.com>

core/src/test/scala/unit/kafka/raft/RaftManagerTest.scala

@@ -30,6 +30,7 @@ import org.apache.kafka.common.Uuid
 import org.apache.kafka.common.metrics.Metrics
 import org.apache.kafka.common.network.ListenerName
 import org.apache.kafka.common.utils.Time
+import org.apache.kafka.common.utils.Utils
 import org.apache.kafka.network.SocketServerConfigs
 import org.apache.kafka.raft.{Endpoints, MetadataLogConfig, QuorumConfig}
 import org.apache.kafka.server.ProcessRole
@@ -126,6 +127,7 @@ class RaftManagerTest {
 
     val logDir = TestUtils.tempDir()
     val nodeId = 1
+    try {
       val raftManager = createRaftManager(
         new TopicPartition("__raft_id_test", 0),
         createConfig(
@@ -137,6 +139,9 @@ class RaftManagerTest {
       )
       assertEquals(nodeId, raftManager.client.nodeId.getAsInt)
       raftManager.shutdown()
+    } finally {
+      Utils.delete(logDir)
+    }
   }
 
   @ParameterizedTest
@@ -155,6 +160,7 @@ class RaftManagerTest {
     }
 
     val nodeId = 1
+    try {
       val raftManager = createRaftManager(
         new TopicPartition("__raft_id_test", 0),
         createConfig(
@@ -171,6 +177,10 @@ class RaftManagerTest {
       raftManager.shutdown()
 
       assertFalse(fileLocked(lockPath))
+    } finally {
+      logDir.foreach(p => Utils.delete(p.toFile))
+      metadataDir.foreach(p => Utils.delete(p.toFile))
+    }
   }
 
   @Test
@@ -179,6 +189,7 @@ class RaftManagerTest {
     val metadataDir = Some(TestUtils.tempDir().toPath)
 
     val nodeId = 1
+    try {
       val raftManager = createRaftManager(
         new TopicPartition("__raft_id_test", 0),
         createConfig(
@@ -195,6 +206,10 @@ class RaftManagerTest {
       raftManager.shutdown()
 
       assertFalse(fileLocked(lockPath))
+    } finally {
+      logDir.foreach(p => Utils.delete(p.toFile))
+      metadataDir.foreach(p => Utils.delete(p.toFile))
+    }
   }
 
   def createMetadataLog(config: KafkaConfig): Unit = {