feat(testing): add timeout when waiting for simulate_ws() to complete

[vytas7]

Fixes #2585.

No LLMs were used to generate the code. Open-weight LLMs were used for review and minor polishing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (ea2b14d) to head (63b07ca).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2723   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           64        64           
  Lines         7990      8000   +10     
  Branches      1106      1106           
=========================================
+ Hits          7990      8000   +10     

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