Minor telemetry cleanup

[AlekSi]

Description

Refs #1323.
Refs #1443.

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 16, 2022 at 5:55PM (UTC)

[codecov]

Codecov Report

Merging #1446 (c2db90a) into main (ca4a67c) will increase coverage by 0.07%.
The diff coverage is 93.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1446      +/-   ##
==========================================
+ Coverage   67.43%   67.51%   +0.07%     
==========================================
  Files         279      279              
  Lines       13408    13409       +1     
==========================================
+ Hits         9042     9053      +11     
+ Misses       3440     3427      -13     
- Partials      926      929       +3     

Impacted Files	Coverage Δ
internal/util/state/metrics.go	88.23% <ø> (ø)
internal/util/telemetry/reporter.go	6.41% <83.33%> (+1.92%)	⬆️
internal/util/telemetry/telemetry.go	90.62% <95.00%> (+0.14%)	⬆️
internal/handlers/common/serverstatus.go	88.23% <100.00%> (-0.45%)	⬇️
internal/handlers/pg/msg_getlog.go	81.44% <100.00%> (+0.19%)	⬆️
internal/handlers/tigris/msg_getlog.go	78.78% <100.00%> (+0.21%)	⬆️
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/handlers/common/filter.go	84.65% <0.00%> (ø)
internal/handlers/tigris/tigrisdb/collections.go	60.00% <0.00%> (+5.71%)	⬆️
internal/handlers/tigris/msg_create.go	74.64% <0.00%> (+7.04%)	⬆️
... and 1 more

Flag	Coverage Δ
integration	63.50% <100.00%> (+0.05%)	⬆️
mongodb	14.04% <0.00%> (-0.01%)	⬇️
pg	52.68% <66.66%> (-0.04%)	⬇️
tigris	35.48% <66.66%> (+0.04%)	⬆️
unit	26.17% <82.75%> (+<0.01%)	⬆️

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

[noisersup]

Thanks for improvements! 🙂 From this point I can see that there were couple of places when the code from last PR could be more consistent to the whole codebase. I just left one comment to discuss