Fix typo existant -> existent

[berland]

existant is French.

[yngve-sk]

🏳️

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.92%. Comparing base (aea8e67) to head (6626b9c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8701   +/-   ##
=======================================
  Coverage   90.92%   90.92%           
=======================================
  Files         343      343           
  Lines       21289    21289           
=======================================
  Hits        19358    19358           
  Misses       1931     1931           

Flag	Coverage Δ
gui-tests	76.13% <ø> (+<0.01%)	⬆️
integration-tests	53.45% <ø> (+0.02%)	⬆️
unit-tests	69.04% <ø> (ø)

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