Update lint rules, use testify/assert

[RyanPotat]

Description

Update lint rules to forbid the use of direct testing.T helpers. Removed a few //nolint:cyclop only by consequence of using assert. 🦆

pion/.goassets#222

Reference issue

N/A

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.16%. Comparing base (03a668d) to head (437516a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #447   +/-   ##
=======================================
  Coverage   66.16%   66.16%           
=======================================
  Files          43       43           
  Lines        3083     3083           
=======================================
  Hits         2040     2040           
  Misses        876      876           
  Partials      167      167           

Flag	Coverage Δ
go	66.16% <ø> (ø)
wasm	26.59% <ø> (ø)

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[JoTurk]

Thank you so much Ryan