/Restaurant/Image/ ?restId=X &menuPartId=Y &dishId=Z &imgId=ShouldBeRemoved &contentType=ShouldBeRemovedAsWell
--> IServicesLayer.DownloadImageOfDish();

Current (WRONG) behavior:
1. UploadImageToDish() is updating the ImageUrl.
2. Currently we replace the existing image with a new one. Always.

Expected (CORRECT) behavior:
1. We should update the imageData, and extract the image ID and content type from it.
2. The image should be added to the list of existing images. An algorithm should decide which image to show.
Disable image upload in the UI level, till it's fully functional.