[DPE-7594] Add custom users to pg_hba filter

[dragomirp]

• Don't skip custom users when generating pg_hba configuration
• Sync PGB changes to the lib

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.29%. Comparing base (fa52899) to head (b051817).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/charm.py	0.00%	3 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (33.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1041      +/-   ##
==========================================
- Coverage   73.33%   73.29%   -0.04%     
==========================================
  Files          15       15              
  Lines        3919     3921       +2     
  Branches      573      574       +1     
==========================================
  Hits         2874     2874              
- Misses        831      833       +2     
  Partials      214      214              

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