Ensure topo read calls consider --topo_read_concurrency

[timvaillancourt]

Description

Related Issue(s)

Resolves #17275

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
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Backward compatibility

• Protobuf changes should be wire-compatible.
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[codecov]

Codecov Report

Attention: Patch coverage is 69.69697% with 10 lines in your changes missing coverage. Please review.

Project coverage is 67.39%. Comparing base (0b51839) to head (07e544c).

Files with missing lines	Patch %	Lines
go/vt/topo/stats_conn.go	57.14%	9 Missing ⚠️
go/vt/vtorc/logic/tablet_discovery.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17276      +/-   ##
==========================================
+ Coverage   67.37%   67.39%   +0.02%     
==========================================
  Files        1573     1573              
  Lines      253113   253103      -10     
==========================================
+ Hits       170538   170586      +48     
+ Misses      82575    82517      -58     

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