CAPA problems have the "Staff Debug Info" button, which allows
instructors to "Reset Attempts" and "Rescore problem" for any individual
student.

XBlocks, such as Drag and Drop v2 do not support those, though the UI
was still present. Clicking any of those links would result in an
"Unknown Error Occurred" message.

This commit hides the two buttons if the associated block does not
support them.