Fix checkstyle violations in Kafka authentication code

- Fix OperatorWrap violation in KafkaOAuth2AuthenticationStrategy
- Remove unused imports from test files
- All checkstyle checks passing

Co-authored-by: saragluna <[email protected]>

Author: Copilot

sdk/spring/spring-cloud-azure-autoconfigure/src/main/java/com/azure/spring/cloud/autoconfigure/implementation/kafka/authentication/KafkaOAuth2AuthenticationStrategy.java

@@ -122,8 +122,8 @@ private void setAzurePropertiesToJaasOptionsIfAbsent(AzureProperties azureProper
 
     private Map<String, String> convertAzurePropertiesToMap(AzureProperties properties) {
         Map<String, String> configs = new HashMap<>();
-        for (AzureKafkaPropertiesUtils.AzureKafkaPasswordlessPropertiesMapping m : 
-                AzureKafkaPropertiesUtils.AzureKafkaPasswordlessPropertiesMapping.values()) {
+        for (AzureKafkaPropertiesUtils.AzureKafkaPasswordlessPropertiesMapping m
+                : AzureKafkaPropertiesUtils.AzureKafkaPasswordlessPropertiesMapping.values()) {
             PROPERTY_MAPPER.from(m.getter().apply(properties)).to(p -> configs.put(m.propertyKey(), p));
         }
         return configs;

sdk/spring/spring-cloud-azure-autoconfigure/src/test/java/com/azure/spring/cloud/autoconfigure/implementation/kafka/AbstractAzureKafkaOAuth2AutoConfigurationTests.java

@@ -3,7 +3,6 @@
 package com.azure.spring.cloud.autoconfigure.implementation.kafka;
 
 import com.azure.spring.cloud.autoconfigure.implementation.context.properties.AzureGlobalProperties;
-import com.azure.spring.cloud.autoconfigure.implementation.kafka.authentication.KafkaOAuth2AuthenticationStrategy;
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.ApplicationContext;

sdk/spring/spring-cloud-azure-autoconfigure/src/test/java/com/azure/spring/cloud/autoconfigure/implementation/kafka/AbstractKafkaPropertiesBeanPostProcessorTest.java

@@ -2,7 +2,6 @@
 // Licensed under the MIT License.
 package com.azure.spring.cloud.autoconfigure.implementation.kafka;
 
-import com.azure.spring.cloud.autoconfigure.implementation.kafka.authentication.KafkaOAuth2AuthenticationStrategy;
 import org.apache.kafka.common.message.ApiVersionsRequestData;
 import org.apache.kafka.common.requests.ApiVersionsRequest;
 import org.junit.jupiter.api.Test;