Update lint rules, force testify/assert

[RyanPotat]

Description

Update lint rules to forbid the use of direct testing.T helpers. Removed multiple //nolint:cyclop by consequence of reduced if blocks.

Reference issue

pion/.goassets#222

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (e57dc04) to head (c9e37f9).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #699   +/-   ##
=======================================
  Coverage   78.56%   78.56%           
=======================================
  Files         101      101           
  Lines        6831     6831           
=======================================
  Hits         5367     5367           
  Misses       1089     1089           
  Partials      375      375           

Flag	Coverage Δ
go	78.59% <100.00%> (ø)
wasm	63.64% <0.00%> (ø)

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