Renaming ChatClientTest to ChatClientTests for consistency

Signed-off-by: Soby Chacko <soby.chacko@broadcom.com>

Author: sobychacko

spring-ai-client-chat/src/test/java/org/springframework/ai/chat/client/ChatClientTest.java renamed to spring-ai-client-chat/src/test/java/org/springframework/ai/chat/client/ChatClientTests.java

@@ -57,7 +57,7 @@
  * @author Thomas Vitale
  */
 @ExtendWith(MockitoExtension.class)
-public class ChatClientTest {
+public class ChatClientTests {
 
 	static Function<String, String> mockFunction = s -> s;