Remove messaging header normalization

Author: AlchemyDing

instrumentation/kafka/kafka-clients/kafka-clients-2.6/library/src/test/java/io/opentelemetry/instrumentation/kafkaclients/v2_6/InterceptorsTest.java

@@ -48,7 +48,7 @@ void assertTraces() {
                       .hasParent(trace.getSpan(0))
                       .hasAttributesSatisfyingExactly(
                           equalTo(
-                              stringArrayKey("messaging.header.Test-Message-Header"),
+                              headerAttributeKey(),
                               singletonList("test")),
                           equalTo(MESSAGING_SYSTEM, "kafka"),
                           equalTo(MESSAGING_DESTINATION_NAME, SHARED_TOPIC),
@@ -117,7 +117,7 @@ void assertTraces() {
 
   private AttributeKey<List<String>> headerAttributeKey() {
     if (SemconvStability.isEmitOldMessageSemconv()) {
-      return AttributeKey.stringArrayKey("messaging.header.Test_MessageHeader");
+      return AttributeKey.stringArrayKey("messaging.header.Test_Message_Header");
     } else {
       return AttributeKey.stringArrayKey("messaging.header.Test-Message-Header");
     }

instrumentation/rocketmq/rocketmq-client/rocketmq-client-4.8/testing/src/main/java/io/opentelemetry/instrumentation/rocketmqclient/v4_8/AbstractRocketMqClientTest.java

@@ -460,7 +460,7 @@ private static Consumer<List<? extends LinkData>> links(SpanContext... spanConte
 
   private AttributeKey<List<String>> headerAttributeKey() {
     if (SemconvStability.isEmitOldMessageSemconv()) {
-      return AttributeKey.stringArrayKey("messaging.header.Test_MessageHeader");
+      return AttributeKey.stringArrayKey("messaging.header.Test_Message_Header");
     } else {
       return AttributeKey.stringArrayKey("messaging.header.Test-Message-Header");
     }

instrumentation/rocketmq/rocketmq-client/rocketmq-client-5.0/testing/src/main/java/io/opentelemetry/instrumentation/rocketmqclient/v5_0/AbstractRocketMqClientTest.java

@@ -603,7 +603,7 @@ private static SpanDataAssert assertProcessSpanWithDelayMessage(
 
   private AttributeKey<List<String>> headerAttributeKey() {
     if (SemconvStability.isEmitOldMessageSemconv()) {
-      return AttributeKey.stringArrayKey("messaging.header.Test_MessageHeader");
+      return AttributeKey.stringArrayKey("messaging.header.Test_Message_Header");
     } else {
       return AttributeKey.stringArrayKey("messaging.header.Test-Message-Header");
     }