pkg/acquisition: refact common 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

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[codecov]

Codecov Report

❌ Patch coverage is 81.35593% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.92%. Comparing base (e325e2c) to head (e561547).

Files with missing lines	Patch %	Lines
pkg/acquisition/acquisition.go	81.35%	7 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4187       +/-   ##
===========================================
+ Coverage   35.67%   62.92%   +27.25%     
===========================================
  Files         466      467        +1     
  Lines       33267    33292       +25     
===========================================
+ Hits        11868    20949     +9081     
+ Misses      20021    10217     -9804     
- Partials     1378     2126      +748     

Flag	Coverage Δ
bats	46.12% <69.49%> (?)
unit-linux	35.74% <76.27%> (+0.08%)	⬆️
unit-windows	25.06% <76.27%> (+0.05%)	⬆️

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