[postgresql] deprecate postgresql monitor

[atoulme]

Description:
Deprecate the postgresql monitor.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.22%. Comparing base (7f27a56) to head (7d67672).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7142      +/-   ##
==========================================
+ Coverage   33.20%   33.22%   +0.01%     
==========================================
  Files         330      330              
  Lines       23325    23326       +1     
==========================================
+ Hits         7746     7749       +3     
+ Misses      14683    14682       -1     
+ Partials      896      895       -1     

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