fix(circles): just skip invalid users in circles instead of throwing an exception

[tcitworld]

Another fix is needed on the front-end side as it seems it creates team attendees instead of actual ones.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.33%. Comparing base (27ef9e2) to head (0aec728).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7554   +/-   ##
=======================================
  Coverage   13.33%   13.33%           
=======================================
  Files         218      218           
  Lines       11360    11360           
  Branches     2714     2728   +14     
=======================================
  Hits         1515     1515           
  Misses       9485     9485           
  Partials      360      360           

Flag	Coverage Δ
javascript	13.33% <ø> (ø)

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