Rename to SampleApplication

Follow convention of other sample applications.

samples/webflux-security/src/main/java/io/spring/sample/graphql/SampleApplication.java

@@ -20,9 +20,9 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 
 @SpringBootApplication
-public class EmployeeServiceApplication {
+public class SampleApplication {
 
 	public static void main(String[] args) {
-		SpringApplication.run(EmployeeServiceApplication.class, args);
+		SpringApplication.run(SampleApplication.class, args);
 	}
 }

samples/webflux-security/src/test/java/io/spring/sample/graphql/SampleApplicationTests.java

@@ -13,7 +13,7 @@ import org.springframework.web.reactive.function.client.ExchangeFilterFunctions;
 import java.util.Collections;
 
 @SpringBootTest()
-class EmployeeServiceApplicationTest {
+class SampleApplicationTests {
 
 	@Autowired
 	private ReactiveWebApplicationContext context;