[SCC-U1000] fix deepsource: Unused code

[datelier]

Description:

SSIA

Related Issue:

Versions:

• Go Version: 1.19.2
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.14.8

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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• ⏪ /rebase - rebase main
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[codecov]

Codecov Report

Base: 30.52% // Head: 30.54% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (b3701d7) compared to base (f2d6254).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1873      +/-   ##
==========================================
+ Coverage   30.52%   30.54%   +0.01%     
==========================================
  Files         367      367              
  Lines       33830    33830              
==========================================
+ Hits        10327    10332       +5     
+ Misses      23090    23084       -6     
- Partials      413      414       +1     

Impacted Files	Coverage Δ
internal/db/nosql/cassandra/cassandra.go	96.07% <ø> (ø)
...ent/core/ngt/service/vqueue/undeleted_index_map.go	66.12% <0.00%> (-1.64%)	⬇️
internal/core/algorithm/ngt/ngt.go	63.93% <0.00%> (+0.64%)	⬆️
internal/errgroup/group.go	95.00% <0.00%> (+1.00%)	⬆️
pkg/agent/core/ngt/service/option.go	91.41% <0.00%> (+1.84%)	⬆️
internal/net/http/middleware/timeout.go	93.33% <0.00%> (+2.22%)	⬆️

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[cloudflare-workers-and-pages]

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Latest commit:	b3701d7
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Branch Preview URL:	https://refactoring-scc-u1000-unused.vald.pages.dev

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