[DPE-5712] Add warning logs to Patroni reinitialisation

[dragomirp]

Adds warning and status change before re-initialising to make it more visible in logs

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.68%. Comparing base (283463b) to head (059da97).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/charm.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #660      +/-   ##
==========================================
- Coverage   71.68%   71.68%   -0.01%     
==========================================
  Files          13       13              
  Lines        3115     3118       +3     
  Branches      465      465              
==========================================
+ Hits         2233     2235       +2     
- Misses        771      772       +1     
  Partials      111      111              

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