PMM-13958 Fix the use of external PostgreSQL

[ademidoff]

PMM-13958

Fixes #3954.

Link to the Feature Build: SUBMODULES-3912

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.67%. Comparing base (b226aa1) to head (f6bbba0).
Report is 6 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #3966      +/-   ##
==========================================
- Coverage   43.69%   43.67%   -0.03%     
==========================================
  Files         369      369              
  Lines       45194    45194              
==========================================
- Hits        19749    19737      -12     
- Misses      23734    23748      +14     
+ Partials     1711     1709       -2     

Flag	Coverage Δ
admin	11.44% <ø> (ø)
agent	52.59% <ø> (-0.11%)	⬇️
managed	45.07% <ø> (ø)
vmproxy	73.45% <ø> (ø)

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