Add HPA for read replica

[ykadowak]

Description:

This PR adds HPA for read replica. Also change the ngt Close logic not try to save index when it's a read replica.

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:

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	7d66fe0
Status:	✅  Deploy successful!
Preview URL:	https://c31daec4.vald.pages.dev
Branch Preview URL:	https://feature-readreplica-hpa.vald.pages.dev

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[vdaas-ci]

[WARNING:INTCFG] Changes in interal/config may require you to change Helm charts. Please check.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (15ce01d) 30.21% compared to head (7d66fe0) 30.31%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
pkg/agent/core/ngt/usecase/agentd.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2307      +/-   ##
==========================================
+ Coverage   30.21%   30.31%   +0.10%     
==========================================
  Files         391      391              
  Lines       40927    40945      +18     
==========================================
+ Hits        12366    12413      +47     
+ Misses      27897    27869      -28     
+ Partials      664      663       -1     

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[kpango]

LGTM

[vdaas-ci]

Profile Report

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

other images