chore: remove FsVault

[paullatzelsperger]

What this PR changes/adds

Removes the FsVault

Why it does that

It was inconsistent, and maintaining it was not worth the effort. We have an easy-to-use OSS alternative (Hashicorp), and an in-mem variant for testing.

Further notes

List other areas of code that have changed but are not necessarily linked to the main feature. This could be method
signature changes, package declarations, bugs that were encountered and were fixed inline, etc.

Linked Issue(s)

Closes # <-- insert Issue number if one exists

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[ndr-brt]

🪓

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.34%. Comparing base (7f20ba5) to head (5e46025).
Report is 267 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4202      +/-   ##
==========================================
- Coverage   71.74%   67.34%   -4.41%     
==========================================
  Files         919     1010      +91     
  Lines       18457    20544    +2087     
  Branches     1037     1154     +117     
==========================================
+ Hits        13242    13835     +593     
- Misses       4756     6236    +1480     
- Partials      459      473      +14     

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