fix(verawood): limit assignable roles to the user's manage-team permissions

[dcoa]

This PR backports the changes in #172 to the verawood release branch.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.70%. Comparing base (12b5783) to head (5c8fc9b).

Additional details and impacted files

@@                 Coverage Diff                  @@
##           release/verawood     #177      +/-   ##
====================================================
+ Coverage             97.64%   97.70%   +0.05%     
====================================================
  Files                    68       69       +1     
  Lines                  1572     1611      +39     
  Branches                396      408      +12     
====================================================
+ Hits                   1535     1574      +39     
  Misses                   37       37              

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