PMM-14643 Config file encryption

[ademidoff]

PMM-14643

Link to the Feature Build: SUBMODULES-4173

If this PR adds, removes or alters one or more API endpoints, please review and add or update the relevant API documentation as well:

• API Docs updated

If this PR is related to some other PRs in this or other repositories, please provide links to those PRs:

• Links to related pull requests (optional).

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.02%. Comparing base (4088a94) to head (f3576a2).
⚠️ Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
agent/config/encryption.go	56.25%	14 Missing and 14 partials ⚠️
agent/config/config.go	87.50%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #4870      +/-   ##
==========================================
+ Coverage   45.98%   46.02%   +0.03%     
==========================================
  Files         365      366       +1     
  Lines       38223    38301      +78     
==========================================
+ Hits        17578    17628      +50     
- Misses      18956    18969      +13     
- Partials     1689     1704      +15     

Flag	Coverage Δ
admin	17.82% <ø> (ø)
agent	53.61% <62.50%> (+0.10%)	⬆️
managed	46.65% <ø> (-0.01%)	⬇️
vmproxy	72.09% <ø> (ø)

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