Do not run OnReadMessageError when a connection closes normally

[michel-laterman]

Fix connection OnReadMessageError callback invocation to not run when the server receives a normal exit control message.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.72%. Comparing base (d508718) to head (2bf609e).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #488   +/-   ##
=======================================
  Coverage   81.71%   81.72%           
=======================================
  Files          27       27           
  Lines        2122     2123    +1     
=======================================
+ Hits         1734     1735    +1     
  Misses        263      263           
  Partials      125      125           

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