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

[weiliu1031]

pr: #38069

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: weiliu1031
To complete the pull request process, please assign congqixia after the PR has been reviewed.
You can assign the PR to them by writing /assign @congqixia in a comment when ready.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[mergify]

@weiliu1031 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.

[codecov]

Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.

Project coverage is 72.23%. Comparing base (580caeb) to head (ef8ccc6).
Report is 2 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%   72.23%   +60.64%     
===========================================
  Files         268     1073      +805     
  Lines       26465   167651   +141186     
===========================================
+ Hits         3068   121111   +118043     
- Misses      23397    42098    +18701     
- Partials        0     4442     +4442     

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

... and 802 files with indirect coverage changes

[weiliu1031]

/run-cpu-e2e

[mergify]

@weiliu1031 E2e jenkins job failed, comment /run-cpu-e2e can trigger the job again.