[BUG] fix metrics bug

[kpango]

Signed-off-by: kpango kpango@vdaas.org

Description:

v1.6.0 includes rpc status metrics bug, when RPC call succeeds metrics expose the state as Unknown it should be OK Status, so I changed it.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.19.1
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.14.8

Types of changes:

• Bug fix [type/bug]
• New feature [type/feature]
• Add tests [type/test]
• Security related changes [type/security]
• Add documents [type/documentation]
• Refactoring [type/refactoring]
• Update dependencies [type/dependency]
• Update benchmarks and performances [type/bench]
• Update CI [type/ci]

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully ran tests with your changes locally?

Checklist:

• I have read the CONTRIBUTING document.
• I have checked open Pull Requests for the similar feature or fixes?
• I have added tests and benchmarks to cover my changes.
• I have ensured all new and existing tests passed.
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation accordingly.

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[codecov]

Codecov Report

Base: 30.02% // Head: 30.02% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (0a180c3) compared to base (7a6936e).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1800   +/-   ##
=======================================
  Coverage   30.02%   30.02%           
=======================================
  Files         371      371           
  Lines       34006    33988   -18     
=======================================
- Hits        10209    10205    -4     
+ Misses      23383    23368   -15     
- Partials      414      415    +1     

Impacted Files	Coverage Δ
...ernal/net/grpc/interceptor/server/metric/metric.go	0.00% <0.00%> (ø)
...nt/core/ngt/service/vqueue/uninserted_index_map.go	70.49% <0.00%> (-2.74%)	⬇️
internal/errgroup/group.go	93.00% <0.00%> (-2.00%)	⬇️
internal/worker/worker.go	83.07% <0.00%> (ø)
internal/core/algorithm/ngt/ngt.go	63.93% <0.00%> (+0.64%)	⬆️

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[hlts2]

Thank you 🙏
LGTM

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Pages

Latest commit:	0a180c3
Status:	✅  Deploy successful!
Preview URL:	https://6d56d470.vald.pages.dev
Branch Preview URL:	https://bugfix-metrics-interceptor-a.vald.pages.dev

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[vdaas-ci]

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