enhance: Add collection id to search request count metrics (#38069)

[weiliu1031]

pr: #38069 #38167

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[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 3 lines in your changes missing coverage. Please review.

Project coverage is 80.56%. Comparing base (580caeb) to head (99b6de1).
Report is 4 commits behind head on 2.4.

Files with missing lines	Patch %	Lines
internal/querynodev2/handlers.go	75.00%	2 Missing ⚠️
internal/querynodev2/services.go	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              2.4   #38144       +/-   ##
===========================================
+ Coverage   11.59%   80.56%   +68.97%     
===========================================
  Files         268     1073      +805     
  Lines       26465   167708   +141243     
===========================================
+ Hits         3068   135111   +132043     
- Misses      23397    28154     +4757     
- Partials        0     4443     +4443     

Files with missing lines	Coverage Δ
pkg/metrics/querynode_metrics.go	100.00% <100.00%> (ø)
internal/querynodev2/services.go	86.96% <88.88%> (ø)
internal/querynodev2/handlers.go	77.58% <75.00%> (ø)

... and 1001 files with indirect coverage changes

[weiliu1031]

/run-cpu-e2e

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[congqixia]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: congqixia, weiliu1031

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