Better exception messages when we could not find proper executable - …

[fizyk]

…closes #598

Chore that needs to be done:

• Add newsfragment pipenv run towncrier create [issue_number].[type].rst

Types are defined in the pyproject.toml, issue_numer either from issue tracker or the Pull request number

[codecov-commenter]

Codecov Report

Patch coverage: 66.66% and project coverage change: -1.71 ⚠️

Comparison is base (9d314a2) 97.15% compared to head (353ff4f) 95.45%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #750      +/-   ##
==========================================
- Coverage   97.15%   95.45%   -1.71%     
==========================================
  Files          12       13       +1     
  Lines         387      396       +9     
==========================================
+ Hits          376      378       +2     
- Misses         11       18       +7     

Flag	Coverage Δ
unittests	95.45% <66.66%> (-1.71%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pytest_postgresql/executor.py	91.66% <60.00%> (-1.89%)	⬇️
pytest_postgresql/factories/process.py	90.69% <60.00%> (-4.18%)	⬇️
pytest_postgresql/exceptions.py	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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