fix: change search latency metric from us unit to ms unit

[zhagnlu]

pr: #37806

[foxspy]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.22%. Comparing base (8ba0a4a) to head (33d96f5).

Additional details and impacted files

@@            Coverage Diff             @@
##              2.5   #37808      +/-   ##
==========================================
+ Coverage   80.95%   83.22%   +2.27%     
==========================================
  Files        1305     1015     -290     
  Lines      182900   157474   -25426     
==========================================
- Hits       148069   131061   -17008     
+ Misses      29627    21210    -8417     
+ Partials     5204     5203       -1     

Components	Coverage Δ
Client	∅ <ø> (∅)
Core	∅ <ø> (∅)
Go	83.25% <ø> (+<0.01%)	⬆️

see 310 files with indirect coverage changes

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