Some @ControllerEndpoint and @RestControllerEndpoint infrastructure remains undeprecated

Similar to https://github.com/spring-projects/spring-boot/issues/41542, `ControllerEndpointHandlerMapping` in both `org.springframework.boot.actuate.endpoint.web.servlet` and `ControllerEndpointHandlerMapping` should have been deprecated as part of https://github.com/spring-projects/spring-boot/issues/31768.