FI-3172: Fix validator sessions

[Jammjammjamm]

Summary

This branch fixes the bug where validator session ids would get set to sessionId rather than a unique identifier.

Testing Guidance

Load up g10/us core and run multiple sessions with different us core versions at the same time. On main, this should cause the validator session error. That error should no longer be present on this branch.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.86%. Comparing base (8bce37b) to head (34e192d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #531   +/-   ##
=======================================
  Coverage   79.86%   79.86%           
=======================================
  Files         253      253           
  Lines       13351    13352    +1     
  Branches     1289     1290    +1     
=======================================
+ Hits        10663    10664    +1     
  Misses       1939     1939           
  Partials      749      749           

Flag	Coverage Δ
backend	91.84% <100.00%> (+<0.01%)	⬆️
frontend	74.54% <ø> (ø)

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