fix(ci): correct cleanup deps - remove all *_test.go files using find

[d-enk]

mutable package was not added

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.39%. Comparing base (975e837) to head (e127688).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #630   +/-   ##
=======================================
  Coverage   94.39%   94.39%           
=======================================
  Files          18       18           
  Lines        3246     3246           
=======================================
  Hits         3064     3064           
  Misses        170      170           
  Partials       12       12           

Flag	Coverage Δ
unittests	94.39% <ø> (ø)

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