pkg/acquisition: refact configuration validation and tests

[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

Details

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[codecov]

Codecov Report

❌ Patch coverage is 76.92308% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.99%. Comparing base (c0709b2) to head (af5077e).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/acquisition/acquisition.go	75.40%	9 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4187      +/-   ##
==========================================
- Coverage   63.39%   62.99%   -0.41%     
==========================================
  Files         451      468      +17     
  Lines       32543    33301     +758     
==========================================
+ Hits        20632    20977     +345     
- Misses       9833    10210     +377     
- Partials     2078     2114      +36     

Flag	Coverage Δ
bats	46.17% <60.00%> (+0.05%)	⬆️
unit-linux	35.99% <75.38%> (+0.40%)	⬆️
unit-windows	24.30% <69.23%> (?)

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[sabban]

lgtm