Bug fix: fix range concurrency branch rule

[vankichi]

Description:

I have fixed the concurrency branch rule at the internal/net/grpc/client.go.
Thanks to #1953 , the backoff problem is resolved.
However, the concurrency branch rule affects the lb service.
Ref: https://github.com/vdaas/vald/blob/main/pkg/gateway/lb/service/gateway.go#L72-L86

So, I have fixed it with @hlts2 and @kpango .

Related Issue:

Versions:

• Go Version: 1.20.2
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 2.0.9

Checklist:

• I have read the CONTRIBUTING document and completed our CLA agreement.
• I have checked open Pull Requests for the similar feature or fixes?

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[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	7563389
Status:	✅  Deploy successful!
Preview URL:	https://ac88c00a.vald.pages.dev
Branch Preview URL:	https://bugfix-internal-fix-range-co.vald.pages.dev

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type	vald-agent-ngt	vald-lb-gateway	vald-discoverer	vald-manager-index
cpu
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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (49ddfea) 29.61% compared to head (7563389) 29.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1986      +/-   ##
==========================================
- Coverage   29.61%   29.59%   -0.02%     
==========================================
  Files         365      365              
  Lines       34242    34245       +3     
==========================================
- Hits        10140    10136       -4     
- Misses      23683    23689       +6     
- Partials      419      420       +1     

Impacted Files	Coverage Δ
internal/net/grpc/client.go	0.00% <0.00%> (ø)
internal/net/grpc/context.go	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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