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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