Add support for admin-only evaluation feedback.

[veluca93]

Admin-only feedback is either automatically generated by the white diff comparison step, or by outputting an additional line on stderr from the checker that starts with ADMIN_MESSAGE:.

[codecov]

Codecov Report

❌ Patch coverage is 78.40909% with 19 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.71%. Comparing base (fcb1905) to head (0847ea5).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
cms/grading/steps/whitediff.py	57.89%	8 Missing ⚠️
cms/grading/tasktypes/util.py	0.00%	5 Missing ⚠️
cms/grading/tasktypes/TwoSteps.py	0.00%	3 Missing ⚠️
cms/grading/steps/trusted.py	90.47%	2 Missing ⚠️
cms/grading/scoretypes/abc.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1642      +/-   ##
==========================================
+ Coverage   54.67%   54.71%   +0.04%     
==========================================
  Files         335      335              
  Lines       27356    27396      +40     
==========================================
+ Hits        14956    14989      +33     
- Misses      12400    12407       +7     

Flag	Coverage Δ
functionaltests	0.00% <0.00%> (ø)
unittests	54.71% <78.40%> (+0.04%)	⬆️

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[prandla]

looks like a neat feature, thanks.

imo it'd make more sense to have the admin details be after the public details column though. did you have any reason for having them in this order?

[veluca93]

looks like a neat feature, thanks.

imo it'd make more sense to have the admin details be after the public details column though. did you have any reason for having them in this order?

No reason :-)