test: skip sample test on non-prod envs

[olavloite]

Skip sample test on non-prod environments, as the PGAdapter wrapper does not support setting a custom endpoint.

[codecov]

Codecov Report

Merging #1018 (e70e399) into postgresql-dialect (5ef9fec) will decrease coverage by 1.78%.
The diff coverage is n/a.

@@                   Coverage Diff                    @@
##             postgresql-dialect    #1018      +/-   ##
========================================================
- Coverage                 90.31%   88.54%   -1.78%     
+ Complexity                 2556     2505      -51     
========================================================
  Files                       141      141              
  Lines                      8508     8508              
  Branches                   1264     1264              
========================================================
- Hits                       7684     7533     -151     
- Misses                      560      675     +115     
- Partials                    264      300      +36     

Flag	Coverage Δ
all_tests	88.54% <ø> (-1.78%)	⬇️

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see 5 files with indirect coverage changes

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