Remove "with" methods in ProblemDetail

ProblemDetail is intended to be extended with additional fields. This
commit removes its "with" methods for chained initialization to keep
it as plain as possible and avoid imposing a particular style on
subclasses.

See gh-27052

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/RequestResponseBodyMethodProcessorTests.java

@@ -434,7 +434,8 @@ public class RequestResponseBodyMethodProcessorTests {
 						"\"title\":\"Bad Request\"," +
 						"\"status\":400," +
 						"\"detail\":null," +
-						"\"instance\":\"/path\"}");
+						"\"instance\":\"/path\"," +
+						"\"properties\":null}");
 	}
 
 	@Test // SPR-13135