Use balancer connection with metadata for operation service.

[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?

2024-09-11T23:06:20.337+0300    WARN    middleware/errors.go:201        operation error {"app": "database", "request_id": "80c44aba-c7d5-4a67-89a6-55ca3c14100d", "method": "/Ydb.Operation.V1.OperationService/GetOperation", "operation_status": "TRANSPORT_ERROR", "issues": "", "grpc_status": "InvalidArgument", "error": "rpc error: code = InvalidArgument desc = Database not specified", "trace_id": "cb56e445d3a79eb3f233c8e006976537"}

Issue Number: N/A

What is the new behavior?

User balancer connection with metadata

Other information

[github-actions]

summary

Base version: v3.80.3-0.20240909181701-1b6f3586630e (master)
Cannot suggest a release version.
Can only suggest a release version when compared against the most recent version of this major: v3.80.2.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.67%. Comparing base (1b6f358) to head (2e9b4b2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1454      +/-   ##
==========================================
- Coverage   67.77%   67.67%   -0.11%     
==========================================
  Files         349      349              
  Lines       36249    36249              
==========================================
- Hits        24569    24530      -39     
- Misses      10592    10622      +30     
- Partials     1088     1097       +9     

Flag	Coverage Δ
experiment	71.86% <100.00%> (-0.28%)	⬇️
go-1.21.x	67.93% <100.00%> (-0.24%)	⬇️
go-1.22.x	65.57% <100.00%> (-0.19%)	⬇️
go-1.23.x	67.61% <100.00%> (-0.15%)	⬇️
integration	53.40% <100.00%> (-0.13%)	⬇️
macOS	40.97% <0.00%> (-0.02%)	⬇️
ubuntu	72.08% <100.00%> (-0.12%)	⬇️
unit	41.38% <0.00%> (-0.02%)	⬇️
windows	41.36% <0.00%> (-0.04%)	⬇️
ydb-23.3	47.77% <100.00%> (-0.03%)	⬇️
ydb-24.1	53.20% <100.00%> (-0.30%)	⬇️
ydb-nightly	71.86% <100.00%> (-0.28%)	⬇️

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[github-actions]

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

Grafana Dashboard

[github-actions]

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

Grafana Dashboard

[github-actions]

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

Grafana Dashboard

[github-actions]

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

Grafana Dashboard

[github-actions]

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

Grafana Dashboard