UDP: prefer new packets (drop older)

[gdamore]

Adds test cases for this and for remote pipe as well.

fixes #

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.21%. Comparing base (75eb6f3) to head (a19dfb1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1917      +/-   ##
==========================================
+ Coverage   80.04%   80.21%   +0.16%     
==========================================
  Files          94       94              
  Lines       24073    24075       +2     
  Branches     3239     3239              
==========================================
+ Hits        19270    19312      +42     
+ Misses       4730     4688      -42     
- Partials       73       75       +2     

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