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 97.87%. Comparing base (a1a340c) to head (2d5402f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #120   +/-   ##
=======================================
  Coverage   97.87%   97.87%           
=======================================
  Files           2        2           
  Lines         141      141           
=======================================
  Hits          138      138           
  Misses          2        2           
  Partials        1        1           

Flag	Coverage Δ
go	97.87% <ø> (ø)
wasm	97.87% <ø> (ø)

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