disable disconnection during non-IP-direct connection

[kpango]

Description:

Same as #2288

Related Issue:

Versions:

• Go Version: 1.21.5
• Docker Version: 20.10.8
• Kubernetes Version: v1.28.4
• NGT Version: 2.1.6

Checklist:

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

Special notes for your reviewer:

[vdaas-ci]

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Latest commit:	f555a94
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Branch Preview URL:	https://refactor-internal-grpc-fix-c.vald.pages.dev

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[vankichi]

LGTM

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (3ef2f35) 29.96% compared to head (f555a94) 29.95%.

Files	Patch %	Lines
internal/net/grpc/client.go	0.00%	16 Missing ⚠️
internal/net/grpc/pool/pool.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2291      +/-   ##
==========================================
- Coverage   29.96%   29.95%   -0.01%     
==========================================
  Files         371      371              
  Lines       36152    36165      +13     
==========================================
+ Hits        10833    10835       +2     
- Misses      24804    24817      +13     
+ Partials      515      513       -2     

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[ykadowak]

Let's merge after e2e passes just in case.

[vdaas-ci]

Profile Report

type	vald-agent-ngt	vald-lb-gateway	vald-discoverer	vald-manager-index
cpu
heap

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