Allow the usage of proxy/diff mode in tests

[AlekSi]

No description provided.

[codecov]

Codecov Report

Merging #477 (aa41226) into main (449e184) will decrease coverage by 0.00%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
- Coverage   57.34%   57.33%   -0.01%     
==========================================
  Files         118      118              
  Lines        6391     6397       +6     
==========================================
+ Hits         3665     3668       +3     
- Misses       2202     2204       +2     
- Partials      524      525       +1     

Flag	Coverage Δ
FerretDB	41.56% <57.14%> (+<0.01%)	⬆️
MongoDB	6.55% <28.57%> (-0.01%)	⬇️
integration	41.59% <64.28%> (+<0.01%)	⬆️
tests	47.22% <ø> (ø)

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Impacted Files	Coverage Δ
integration/setup.go	82.78% <64.28%> (-1.70%)	⬇️

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