Fix issues for the Unix listener

[chilagrow]

Description

Closes #1295.

• test-integration-pg runs on unix socket, -target-unix-socket is already specified in Taskfile.yml.
• We don't support unix socket on windows, windows always uses TCP.

Readiness checklist

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[vercel]

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Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Nov 18, 2022 at 5:35PM (UTC)

[codecov]

Codecov Report

Merging #1397 (4753eb9) into main (1a1885e) will decrease coverage by 0.17%.
The diff coverage is 87.91%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1397      +/-   ##
==========================================
- Coverage   67.93%   67.75%   -0.18%     
==========================================
  Files         279      279              
  Lines       13500    13540      +40     
==========================================
+ Hits         9171     9174       +3     
- Misses       3411     3436      +25     
- Partials      918      930      +12     

Impacted Files	Coverage Δ
internal/handlers/pg/msg_explain.go	58.33% <0.00%> (-3.64%)	⬇️
integration/setup/setup_compat.go	84.84% <75.00%> (-1.77%)	⬇️
integration/setup/common_unix.go	85.29% <84.84%> (-14.71%)	⬇️
integration/setup/setup.go	87.17% <93.33%> (+0.14%)	⬆️
integration/setup/common.go	93.84% <100.00%> (-0.10%)	⬇️
internal/handlers/tigris/msg_listdatabases.go	45.07% <0.00%> (-5.64%)	⬇️
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/handlers/common/filter.go	84.65% <0.00%> (-1.73%)	⬇️
... and 2 more

Flag	Coverage Δ
integration	63.99% <87.91%> (-0.02%)	⬇️
mongodb	14.09% <28.57%> (-0.13%)	⬇️
pg	53.14% <83.51%> (-0.01%)	⬇️
tigris	36.24% <64.83%> (+0.04%)	⬆️
unit	26.41% <0.00%> (-0.03%)	⬇️

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

[w84thesun]

Checked it on Windows, looks like everything is working fine. A typo fix is needed.

[vercel]

Deployment failed with the following error:

Resource is limited - try again in 52 minutes (more than 100, code: "api-deployments-free-per-day").

[rumyantseva]

LGTM.

Tests pass on my env.

[rumyantseva]

LGTM