g3proxy: add user coverage test CI

[zh-jq-b]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.30769% with 4 lines in your changes missing coverage. Please review.

Project coverage is 42.01%. Comparing base (dbd1c63) to head (8f4876e).

Files with missing lines	Patch %	Lines
lib/g3-io-ext/src/limit/token_bucket/datagram.rs	90.90%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #370      +/-   ##
==========================================
+ Coverage   41.35%   42.01%   +0.65%     
==========================================
  Files        1089     1089              
  Lines       98366    98410      +44     
==========================================
+ Hits        40680    41344     +664     
+ Misses      57686    57066     -620     

Flag	Coverage Δ
g3proxy	42.01% <92.30%> (+0.65%)	⬆️
lib	25.39% <67.30%> (+0.38%)	⬆️

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