rP6facee6140ea

Communicate max dimensions of profile images before upload

Summary:
Trying to set a large image as a project profile image, Phorge displays the "it is a mystery" placeholder image without errors or explanation.
Thus communicate the maximum file dimensions for transforming thumbnails, like Phorge already does for supported file format types.

Closes T15984

Test Plan:
* Go to http://phorge.localhost/project/picture/1/ and http://phorge.localhost/people/picture/1/ and set an image with 4096×4096px and an…