Update lint rules, use testify/assert

[RyanPotat]

Description

Update lint rules to forbid the use of direct testing.T helpers.

pion/.goassets#222

Reference issue

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.16%. Comparing base (a16164d) to head (19bb927).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   79.16%   79.16%           
=======================================
  Files           2        2           
  Lines          48       48           
=======================================
  Hits           38       38           
  Misses          7        7           
  Partials        3        3           

Flag	Coverage Δ
go	79.16% <ø> (ø)
wasm	79.16% <ø> (ø)

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