Some @ControllerEndpoint and @RestControllerEndpoint infrastructure remains undeprecated

[wilkinsona]

The support was deprecated in #31768 but I think we missed a couple of classes. As far as I can tell, the following should also be deprecated:

• org.springframework.boot.actuate.endpoint.web.annotation.ControllerEndpointsSupplier
• org.springframework.boot.actuate.endpoint.web.annotation.ExposableControllerEndpoint

[wilkinsona]

Closing in favor of #41596.