Fix deepsource: SCC-S1003 replace call to strings.Index with strings.Contains

[vankichi]

Description:

I have fixed SCC-S1003

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:

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[codecov]

Codecov Report

Base: 30.57% // Head: 30.52% // Decreases project coverage by -0.04% ⚠️

Coverage data is based on head (fcd1f33) compared to base (dd6045c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1853      +/-   ##
==========================================
- Coverage   30.57%   30.52%   -0.05%     
==========================================
  Files         367      367              
  Lines       33823    33823              
==========================================
- Hits        10341    10326      -15     
- Misses      23072    23081       +9     
- Partials      410      416       +6     

Impacted Files	Coverage Δ
internal/info/info.go	88.35% <100.00%> (ø)
...nt/core/ngt/service/vqueue/uninserted_index_map.go	70.43% <0.00%> (-8.61%)	⬇️
...ent/core/ngt/service/vqueue/undeleted_index_map.go	68.30% <0.00%> (-3.28%)	⬇️
internal/worker/worker.go	83.84% <0.00%> (+0.76%)	⬆️
internal/net/dialer.go	78.40% <0.00%> (+0.99%)	⬆️
pkg/agent/core/ngt/service/option.go	91.41% <0.00%> (+1.84%)	⬆️

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