ContactGroup.group_type can no longer be 'U'

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #610 (b517840) into main (736b5c7) will increase coverage by 0.45%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #610      +/-   ##
==========================================
+ Coverage   62.20%   62.66%   +0.45%     
==========================================
  Files         126      126              
  Lines        8880     9253     +373     
==========================================
+ Hits         5524     5798     +274     
- Misses       2495     2541      +46     
- Partials      861      914      +53     

Impacted Files	Coverage Δ
core/models/contacts.go	65.12% <ø> (ø)
core/models/groups.go	58.75% <ø> (ø)
web/org/metrics.go	82.22% <100.00%> (-1.23%)	⬇️
core/models/sessions.go	58.46% <0.00%> (+5.83%)	⬆️
core/tasks/handler/worker.go	58.40% <0.00%> (+9.35%)	⬆️

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