Make sure to always annotate can_edit and can_view.

[rtibbles]

Summary

Description of the change(s) you made

Fixes regression whereby can_edit and can_view were not getting annotated on the User queryset for the ChannelUser endpoint.
Adds regression test to try to catch this in the future.

Fixes #3125

[bjester]

Looks good if tests pass

[codecov]

Codecov Report

Merging #3126 (ef63539) into hotfixes (28587f8) will increase coverage by 5.35%.
The diff coverage is 93.05%.

@@             Coverage Diff              @@
##           hotfixes    #3126      +/-   ##
============================================
+ Coverage     80.80%   86.16%   +5.35%     
============================================
  Files           281      305      +24     
  Lines         12659    16476    +3817     
============================================
+ Hits          10229    14196    +3967     
+ Misses         2430     2280     -150     

Impacted Files	Coverage Δ
contentcuration/contentcuration/decorators.py	56.60% <50.00%> (-37.60%)	⬇️
...ntentcuration/contentcuration/db/models/manager.py	91.05% <90.83%> (-8.95%)	⬇️
contentcuration/contentcuration/db/models/query.py	94.23% <93.75%> (-5.77%)	⬇️
contentcuration/contentcuration/forms.py	82.35% <94.04%> (+33.89%)	⬆️
contentcuration/contentcuration/api.py	92.06% <100.00%> (+1.43%)	⬆️
contentcuration/contentcuration/apps.py	100.00% <100.00%> (+11.11%)	⬆️
contentcuration/contentcuration/celery.py	90.00% <100.00%> (-1.67%)	⬇️
...tentcuration/contentcuration/context_processors.py	100.00% <100.00%> (ø)
...ontentcuration/contentcuration/db/advisory_lock.py	100.00% <100.00%> (ø)
...tcuration/contentcuration/db/models/expressions.py	95.23% <100.00%> (-4.77%)	⬇️
... and 191 more

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