Revert "SAK-43270 Added submitters image to Sakai Grader (sakaiprojec…

…t#7933)"

This reverts commit e7ab655.

Tagging Sakai version 12.7

Tagging Sakai version 19.3

Tagging Sakai version 19.2

Tagging Sakai version 19.1

Tagging Sakai version 19.0

SAK-41498 Rubrics + Samigo : solve issue grading several users on que…

…stions screen (sakaiproject#6661)

(cherry picked from commit ef0da3a)

Tagging Sakai version 12.6

SAK-41309 SAK-40650 Grading issue where linked gradebook title is num…

…eric (sakaiproject#6544)

(cherry picked from commit 67f1685)

Tagging Sakai version 12.5