Less viewers

[rowanseymour]

• Remove viewers as an org feature
• Only allow existing viewer users to remain as viewers
• Add warning that this role is being removed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9f474a9) to head (70afaba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5439   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          510       511    +1     
  Lines        25255     25264    +9     
=========================================
+ Hits         25255     25264    +9     

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