Bug - Proxy should not silently allow a unhandled message type from the server. (SYN-10290)

[vEpiphyte]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.72%. Comparing base (83e0ab2) to head (37d506e).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4832      +/-   ##
==========================================
- Coverage   97.72%   97.72%   -0.01%     
==========================================
  Files         298      298              
  Lines       62502    62504       +2     
==========================================
+ Hits        61082    61083       +1     
- Misses       1420     1421       +1     

Flag	Coverage Δ
linux	97.65% <100.00%> (-0.01%)	⬇️
linux_replay	93.41% <100.00%> (+<0.01%)	⬆️

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