Add update operators data document fields order test

[w84thesun]

Description

This PR closes #1138.

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	Oct 11, 2022 at 9:48PM (UTC)

[codecov]

Codecov Report

Merging #1238 (211a6fd) into main (470940b) will decrease coverage by 0.11%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1238      +/-   ##
==========================================
- Coverage   66.58%   66.47%   -0.12%     
==========================================
  Files         268      268              
  Lines       12974    12974              
==========================================
- Hits         8639     8624      -15     
- Misses       3390     3403      +13     
- Partials      945      947       +2     

Impacted Files	Coverage Δ
internal/handlers/pg/pgdb/settings.go	39.53% <0.00%> (-4.66%)	⬇️
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/handlers/common/filter.go	86.58% <0.00%> (-0.63%)	⬇️

Flag	Coverage Δ
integration	60.92% <ø> (-0.12%)	⬇️
mongodb	14.04% <ø> (-0.03%)	⬇️
pg	50.73% <ø> (-0.12%)	⬇️
tigris	33.05% <ø> (-0.03%)	⬇️
unit	25.95% <ø> (-0.33%)	⬇️

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[rumyantseva]

LGTM