[DPE-8462] Port tests

[dragomirp]

Issue

Solution

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 50.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.77%. Comparing base (2a806f7) to head (7ca8bf8).

Files with missing lines	Patch %	Lines
src/patroni.py	37.50%	4 Missing and 1 partial ⚠️
src/charm.py	60.00%	2 Missing and 2 partials ⚠️

❌ Your project check has failed because the head coverage (65.77%) is below the target coverage (70.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff               @@
##           refresh-v3    #1149      +/-   ##
==============================================
- Coverage       65.85%   65.77%   -0.09%     
==============================================
  Files              18       18              
  Lines            3904     3915      +11     
  Branches          568      571       +3     
==============================================
+ Hits             2571     2575       +4     
- Misses           1149     1154       +5     
- Partials          184      186       +2     

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