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

[zhagnlu]

#37805

[mergify]

@zhagnlu Thanks for your contribution. Please submit with DCO, see the contributing guide https://github.com/milvus-io/milvus/blob/master/CONTRIBUTING.md#developer-certificate-of-origin-dco.

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[foxspy]

/lgtm

[czs007]

/approve
/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: czs007, foxspy, zhagnlu

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@zhagnlu E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.04%. Comparing base (7c5a801) to head (2d51f71).
Report is 11 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #37806      +/-   ##
==========================================
+ Coverage   81.02%   81.04%   +0.01%     
==========================================
  Files        1358     1358              
  Lines      190427   190427              
==========================================
+ Hits       154288   154325      +37     
+ Misses      30650    30624      -26     
+ Partials     5489     5478      -11     

Components	Coverage Δ
Client	72.16% <ø> (ø)
Core	68.87% <100.00%> (ø)
Go	83.21% <ø> (+0.02%)	⬆️

Files with missing lines	Coverage Δ
internal/core/src/exec/operator/FilterBitsNode.cpp	92.98% <100.00%> (ø)
internal/core/src/exec/operator/GroupByNode.cpp	97.56% <100.00%> (ø)
...ternal/core/src/exec/operator/VectorSearchNode.cpp	98.07% <100.00%> (ø)

... and 27 files with indirect coverage changes

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[zhagnlu]

/run-cpu-e2e

[mergify]

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@zhagnlu go-sdk check failed, comment rerun go-sdk can trigger the job again.

[mergify]

@zhagnlu E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[czs007]

/lgtm