Fix DCONF policy manager removing userdb on empty policy

[denisonbarbosa]

We decided to go for this approach to support the purge command. Since it's not yet fully functional and this change is breaking user sessions that do not have at least one DCONF-related policy applied, we should revert this change for now and consider a better way of removing the leftover files in the future.

Closes #1002.

UDENG-3732.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.84%. Comparing base (2f9beeb) to head (8a473d6).
Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1070      +/-   ##
==========================================
+ Coverage   93.80%   93.84%   +0.03%     
==========================================
  Files          79       79              
  Lines        6881     6873       -8     
==========================================
- Hits         6455     6450       -5     
+ Misses        416      413       -3     
  Partials       10       10              

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[didrocks]

Feeling sorry to see this revert from Gabriel's code, but yeah, necessary, I just have a suggestion on adding some comments in the tests, to ensure this time we don’t drop it without a second thought…

[didrocks]

I adjusted the comments in the proposal to be more exact :)

[didrocks]

let’s restore dconf \o/