Backport PR #3480 to release/v1.7 for Support dynamic edge size parameter for Search API

[vdaas-ci]

Description

SSIA

Related Issue

Versions

• Vald Version: v1.7.17
• Go Version: v1.25.7
• Rust Version: v1.93.0
• Docker Version: v29.2.1
• Kubernetes Version: v1.35.0
• Helm Version: v4.1.0
• NGT Version: v2.5.1
• Faiss Version: v1.13.2

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

⚠️ This PR is PoC and uses feature branch of vdaas/ngt's dynamic-edge-size branch

Summary by CodeRabbit

• New Features

  • Added edge_size (int32) to search configuration across search APIs, exposing a new search tuning parameter.

• Documentation

  • Updated API docs, proto schema, and OpenAPI specs to document the new edge_size field.

• Chores

  • Updated external build source for the NGT dependency.
  • Bumped several Rust crate versions.

• Refactor

  • Normalized API schema/reference names in OpenAPI specs for consistency.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/v1.7@849796c). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff               @@
##             release/v1.7    #3501   +/-   ##
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  Coverage                ?   25.86%           
===============================================
  Files                   ?      500           
  Lines                   ?    42392           
  Branches                ?        0           
===============================================
  Hits                    ?    10965           
  Misses                  ?    30697           
  Partials                ?      730           

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