Add "_id" string to linter exceptions

[w84thesun]

Description

In this PR "_id" constant was removed and linter settings were tweaked to not trigger a warning.

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]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Nov 4, 2022 at 0:35AM (UTC)

[codecov]

Codecov Report

Merging #1364 (c909e5c) into main (2b3100b) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1364      +/-   ##
==========================================
- Coverage   67.24%   67.13%   -0.11%     
==========================================
  Files         279      279              
  Lines       13228    13228              
==========================================
- Hits         8895     8881      -14     
- Misses       3403     3419      +16     
+ Partials      930      928       -2     

Impacted Files	Coverage Δ
internal/types/document.go	87.77% <100.00%> (ø)
internal/types/document_validation.go	96.15% <100.00%> (ø)
internal/handlers/tigris/tigrisdb/errors.go	50.00% <0.00%> (-22.23%)	⬇️
internal/clientconn/conninfo/conn_info.go	66.66% <0.00%> (-16.67%)	⬇️
internal/handlers/tigris/tigrisdb/databases.go	66.66% <0.00%> (-7.70%)	⬇️
internal/handlers/pg/pgdb/settings.go	41.35% <0.00%> (-4.52%)	⬇️
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/handlers/common/filter.go	86.74% <0.00%> (ø)
internal/handlers/tigris/msg_listdatabases.go	50.70% <0.00%> (+5.63%)	⬆️

Flag	Coverage Δ
integration	63.21% <66.66%> (-0.10%)	⬇️
mongodb	14.17% <16.66%> (-0.03%)	⬇️
pg	52.36% <66.66%> (-0.07%)	⬇️
tigris	35.28% <50.00%> (-0.05%)	⬇️
unit	26.27% <100.00%> (-0.04%)	⬇️

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