MINOR: Cleanup Core Module- Scala Modules (2/n)

[sjhajharia]

Now that Kafka Brokers support Java 17, this PR makes some changes in
core module. The changes in this PR are limited to only the Scala files
in the Core module's tests. The unit tests module is still pending. It
shall follow next. The changes mostly include:

• Collections.emptyList(), Collections.singletonList() and Arrays.asList() are replaced with List.of()
• Collections.emptyMap() and Collections.singletonMap() are replaced with Map.of()
• Collections.singleton() is replaced with Set.of()

To be clear, the directories being targeted in this PR are:
KafkaApisTest.scala

[FrankYang0529]

@sjhajharia, I think we can do more in this PR.

1. mutable.HashSet -> util.Set.of

   kafka/core/src/test/scala/unit/kafka/server/KafkaApisTest.scala

   Lines 10731 to 10733 in 2cd733c

   	val resources = new mutable.HashSet[String]
   	resources.add("test1")
   	resources.add("test2")

2. util.HashMap -> util.Map.of

   kafka/core/src/test/scala/unit/kafka/server/KafkaApisTest.scala

   Lines 5511 to 5523 in 2cd733c

   	val erroneousPartitions: util.Map[TopicIdPartition, ShareFetchResponseData.PartitionData] = new util.HashMap()
   	erroneousPartitions.put(
   	tp2,
   	new ShareFetchResponseData.PartitionData()
   	.setPartitionIndex(1)
   	.setErrorCode(Errors.UNKNOWN_TOPIC_OR_PARTITION.code)
   	)
   	erroneousPartitions.put(
   	tp3,
   	new ShareFetchResponseData.PartitionData()
   	.setPartitionIndex(0)
   	.setErrorCode(Errors.UNKNOWN_TOPIC_OR_PARTITION.code)
   	)

[sjhajharia]

Thanks @FrankYang0529
Adding in the changes you suggested.

[frankvicky]

I think we can also remove the operations of asScala followed by asJava.
For example:

kafka/core/src/test/scala/unit/kafka/server/KafkaApisTest.scala

Lines 3016 to 3018 in c009eed

	actions.asScala.map { action =>
	acls.getOrElse(action.resourcePattern.name, AuthorizationResult.DENIED)
	}.asJava

[sjhajharia]

Thanks @frankvicky
Adding in the changes in a subsequent commit. Pls review when possible!

[m1a2st]

Thanks for this patch, LGTM