UDP: burst testing to improve coverage

[gdamore]

We are finding that on darwin its very easy for us to lose UDP messages as the socket buffer appears to be depressingly small.

fixes #

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.51%. Comparing base (0bef8c0) to head (f9591be).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1892      +/-   ##
==========================================
- Coverage   79.54%   79.51%   -0.03%     
==========================================
  Files          95       95              
  Lines       22339    22359      +20     
  Branches     3388     3390       +2     
==========================================
+ Hits        17769    17779      +10     
- Misses       4496     4505       +9     
- Partials       74       75       +1     

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