Refactor search status

[kpango]

Description:

Remove unnecessary goroutine execution from search logic.
And refine gRPC status code.

Related Issue:

Versions:

• Go Version: 1.21.0
• Docker Version: 20.10.8
• Kubernetes Version: v1.28.1
• NGT Version: 2.1.3

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
• 🍱 /format - format codes and add licenses
• ✅ /gen-test - generate test codes
• 🏷️ /label - add labels
• 🔚 2️⃣ 🔚 /label actions/e2e-deploy - run E2E deploy & integration test

[codecov]

Codecov Report

Patch has no changes to coverable lines.

❗ Current head 9786def differs from pull request most recent head 217dfb2. Consider uploading reports for the commit 217dfb2 to get more accurate results

Files Changed	Coverage
cmd/agent/core/ngt/main.go	ø
cmd/agent/sidecar/main.go	ø
cmd/discoverer/k8s/main.go	ø
cmd/gateway/filter/main.go	ø
cmd/gateway/lb/main.go	ø
cmd/manager/index/main.go	ø
cmd/tools/cli/loadtest/main.go	ø
cmd/tools/cli/vdctl/main.go	ø
hack/benchmark/assets/x1b/loader.go	ø
hack/benchmark/core/benchmark/benchmark.go	ø
... and 22 more

📢 Thoughts on this report? Let us know!.

[github-actions]

[FOSSA] The scan result will be available at https://app.fossa.com/projects/custom%2B21465%2Fvald/refs/branch/refactor%2Flbgw%2Faggregation-search-status/64aa31eb2a81aaf9291443efe1b3a77153a9372a

[vdaas-ci]

Profile Report

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

other images

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	217dfb2
Status:	⚡️  Build in progress...

View logs