Rename stub.%l to grader.%l in Communication tasks.

[veluca93]

Fixes #1705.

[codecov]

Codecov Report

❌ Patch coverage is 89.84772% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.46%. Comparing base (114df9c) to head (8b5dfc2).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
cmscontrib/loaders/italy_yaml.py	0.00%	8 Missing ⚠️
cmscontrib/loaders/tps.py	0.00%	8 Missing ⚠️
cms/grading/tasktypes/Communication.py	85.71%	2 Missing ⚠️
cmstestsuite/unit_tests/cmscontrib/Update49Test.py	97.36%	1 Missing ⚠️
...te/unit_tests/grading/tasktypes/InteractiveTest.py	97.95%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1711      +/-   ##
==========================================
+ Coverage   55.05%   55.46%   +0.41%     
==========================================
  Files         339      342       +3     
  Lines       27401    27551     +150     
==========================================
+ Hits        15085    15282     +197     
+ Misses      12316    12269      -47     

Flag	Coverage Δ
functionaltests	0.00% <0.00%> (ø)
unittests	55.46% <89.84%> (+0.41%)	⬆️

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[prandla]

Interactive is now the only task type to still call it "stub". presumably we should do the same thing there for consistency?

[veluca93]

Interactive is now the only task type to still call it "stub". presumably we should do the same thing there for consistency?

Completely forgot about it :-) done in a second commit (still in the same PR and modifying the same updater)