Fix concurrent map writes in metrics

[neyguvj]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

[github-actions]

summary

Base version: v3.80.6-0.20240917094259-e582517397b8 (master)
Cannot suggest a release version.
Can only suggest a release version when compared against the most recent version of this major: v3.80.5.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.87%. Comparing base (e582517) to head (4f959f2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1468      +/-   ##
==========================================
- Coverage   68.00%   67.87%   -0.14%     
==========================================
  Files         350      350              
  Lines       36289    36292       +3     
==========================================
- Hits        24678    24632      -46     
- Misses      10536    10576      +40     
- Partials     1075     1084       +9     

Flag	Coverage Δ
experiment	72.13% <100.00%> (-0.08%)	⬇️
go-1.21.x	68.02% <100.00%> (-0.27%)	⬇️
go-1.22.x	65.69% <100.00%> (-0.24%)	⬇️
go-1.23.x	67.85% <100.00%> (-0.08%)	⬇️
integration	53.61% <100.00%> (-0.44%)	⬇️
macOS	40.97% <0.00%> (-0.02%)	⬇️
ubuntu	72.28% <100.00%> (-0.16%)	⬇️
unit	41.41% <0.00%> (-0.02%)	⬇️
windows	41.40% <0.00%> (-0.03%)	⬇️
ydb-23.3	47.62% <100.00%> (-0.24%)	⬇️
ydb-24.1	53.44% <100.00%> (-0.55%)	⬇️
ydb-nightly	72.13% <100.00%> (-0.08%)	⬇️

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[github-actions]

🌋 Here are results of SLO test for Native ydb-go-sdk/v3 over table-service:

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[github-actions]

🌋 Here are results of SLO test for Go SDK gorm:

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[github-actions]

🌋 Here are results of SLO test for Go SDK database/sql:

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[github-actions]

🌋 Here are results of SLO test for Go SDK xorm:

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[github-actions]

🌋 Here are results of SLO test for Native ydb-go-sdk/v3 over query-service:

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