Move getParameter tests

[AlekSi]

Refs #417.

[codecov]

Codecov Report

Merging #450 (151d19d) into main (e95eb88) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #450   +/-   ##
=======================================
  Coverage   57.85%   57.85%           
=======================================
  Files         117      117           
  Lines        6138     6138           
=======================================
  Hits         3551     3551           
  Misses       2067     2067           
  Partials      520      520           

Flag	Coverage Δ
FerretDB	39.87% <100.00%> (+0.20%)	⬆️
MongoDB	6.32% <0.00%> (ø)
integration	39.90% <100.00%> (+0.20%)	⬆️
tests	48.27% <0.00%> (-0.21%)	⬇️

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Impacted Files	Coverage Δ
internal/handlers/pg/msg_getparameter.go	66.66% <100.00%> (ø)

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