lint: enable errcheck; add allowlist and explicit checks

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

Attention: Patch coverage is 30.23256% with 30 lines in your changes missing coverage. Please review.

Project coverage is 59.33%. Comparing base (fe931af) to head (c7dd66d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/acquisition/modules/appsec/appsec.go	0.00%	4 Missing ⚠️
pkg/cticlient/example/fire.go	0.00%	4 Missing ⚠️
pkg/parser/stage.go	0.00%	4 Missing ⚠️
cmd/crowdsec-cli/climachine/add.go	40.00%	3 Missing ⚠️
...g/acquisition/modules/kubernetesaudit/k8s_audit.go	0.00%	2 Missing and 1 partial ⚠️
pkg/exprhelpers/helpers.go	66.66%	2 Missing and 1 partial ⚠️
pkg/leakybucket/manager_load.go	0.00%	3 Missing ⚠️
pkg/parser/node.go	0.00%	2 Missing and 1 partial ⚠️
pkg/setup/install.go	0.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3403      +/-   ##
==========================================
- Coverage   59.33%   59.33%   -0.01%     
==========================================
  Files         358      358              
  Lines       38398    38411      +13     
==========================================
+ Hits        22785    22792       +7     
- Misses      13723    13729       +6     
  Partials     1890     1890              

Flag	Coverage Δ
bats	42.25% <17.94%> (+0.01%)	⬆️
unit-linux	33.18% <13.95%> (-0.02%)	⬇️
unit-windows	28.46% <13.95%> (-0.02%)	⬇️

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