Add option to automatically generate diffs of failing graphical unit tests

[Darylgolden]

Enhancement proposal

Will allow developers to more easily check how graphical unit tests are failing. One step towards allowing our GitHub CI to automatically post these diffs as well.

Additional comments

[joybh98]

Hi, is this something a beginner to this project can contribute on ? If so, I'll like to take this issue

[joybh98]

hey @Darylgolden when you're free please let me know !

[Darylgolden]

It's not exactly a beginner task, but feel free to give it a try!