In NCMP, getResourceDataForPassthroughOperational endpoint is a read-only endpoint, so it should only support accept header type: application/json.

Right now what we experienced is, that in the code it is implemented that it supports both json and yang+json, which should not be the case.

Please fix this, so this read-only(GET) endpoint only works with application/json accept header, and does not with yang+json.