[DO NOT MERGE] add cancelable search

[kpango]

Description:

SSIA

Related Issue:

Versions:

• Go Version: 1.20.6
• Docker Version: 20.10.8
• Kubernetes Version: v1.27.3
• NGT Version: 2.0.16

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]

[CHATOPS:HELP] ChatOps commands.

• 🙆‍♀️ /approve - approve
• 💌 /changelog - replace the PR body by changelog details
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• ⏪ /rebase - rebase main
• 🔚 2️⃣ 🔚 /label actions/e2e-deploy - run E2E deploy & integration test

[codecov]

Codecov Report

Patch coverage: 55.55% and project coverage change: +0.04 🎉

Comparison is base (6f5fb18) 31.09% compared to head (85314f6) 31.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2134      +/-   ##
==========================================
+ Coverage   31.09%   31.14%   +0.04%     
==========================================
  Files         339      339              
  Lines       32831    32828       -3     
==========================================
+ Hits        10210    10223      +13     
+ Misses      22169    22148      -21     
- Partials      452      457       +5     

Impacted Files	Coverage Δ
internal/errors/ngt.go	60.86% <0.00%> (-9.14%)	⬇️
internal/test/goleak/goleak.go	0.00% <ø> (ø)
pkg/agent/core/ngt/handler/grpc/linear_search.go	0.00% <0.00%> (ø)
pkg/agent/core/ngt/service/ngt.go	35.80% <0.00%> (ø)
internal/core/algorithm/ngt/ngt.go	66.88% <61.11%> (+4.14%)	⬆️

... and 3 files with indirect coverage changes

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[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	85314f6
Status:	✅  Deploy successful!
Preview URL:	https://2ebc3f97.vald.pages.dev
Branch Preview URL:	https://refactor-agent-ngt-add-cance.vald.pages.dev

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