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

[weiliu1031]

pr: #38069

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[codecov]

Codecov Report

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

Project coverage is 81.03%. Comparing base (fcbed3a) to head (909bf2d).

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             @@
##              2.5   #38145       +/-   ##
===========================================
+ Coverage   68.87%   81.03%   +12.15%     
===========================================
  Files         289     1360     +1071     
  Lines       25481   190678   +165197     
===========================================
+ Hits        17551   154516   +136965     
- Misses       7930    30665    +22735     
- Partials        0     5497     +5497     

Components	Coverage Δ
Client	72.16% <ø> (∅)
Core	68.87% <ø> (ø)
Go	83.20% <82.35%> (∅)

Files with missing lines	Coverage Δ
pkg/metrics/querynode_metrics.go	100.00% <ø> (ø)
internal/querynodev2/services.go	87.39% <88.88%> (ø)
internal/querynodev2/handlers.go	77.19% <75.00%> (ø)

... and 1068 files with indirect coverage changes