test: Skip leaked pion goroutines in peer

[kylecarbs]

These get cleaned up a few milliseconds after exit, but
cannot be hooked in the current pion API.

[codecov]

Codecov Report

Merging #108 (da38e1e) into main (58f3e43) will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
- Coverage   72.01%   71.87%   -0.14%     
==========================================
  Files          89       89              
  Lines        3627     3627              
  Branches       55       55              
==========================================
- Hits         2612     2607       -5     
- Misses        795      799       +4     
- Partials      220      221       +1     

Flag	Coverage Δ
unittest-go-macos-latest	67.62% <ø> (-0.38%)	⬇️
unittest-go-ubuntu-latest	70.00% <ø> (+0.22%)	⬆️
unittest-go-windows-latest	67.31% <ø> (+0.41%)	⬆️
unittest-js	78.30% <ø> (ø)

Impacted Files	Coverage Δ
peer/conn.go	76.04% <0.00%> (-1.05%)	⬇️
peer/channel.go	84.14% <0.00%> (-0.61%)	⬇️

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[jawnsy]

Nice 👍