enhance: [2.3] init the hook when creating the proxy object

[SimFG]

• issue: [Bug]: proxy auth interceptor may fail in first few search requests due to hook initialization logic #34885
• pr: fix: Unify hook singleton implementation in proxy #34887

[xiaofan-luan]

/lgtm
/approve

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 83.15%. Comparing base (a5deaa1) to head (9ae5220).
Report is 1 commits behind head on 2.3.

Additional details and impacted files

@@            Coverage Diff             @@
##              2.3   #34936      +/-   ##
==========================================
+ Coverage   83.07%   83.15%   +0.08%     
==========================================
  Files         852      852              
  Lines      107744   107232     -512     
==========================================
- Hits        89507    89174     -333     
+ Misses      14928    14741     -187     
- Partials     3309     3317       +8     

Files	Coverage Δ
internal/proxy/hook_interceptor.go	80.85% <100.00%> (+2.95%)	⬆️
internal/querycoordv2/utils/util.go	100.00% <ø> (ø)
internal/proxy/proxy.go	69.08% <0.00%> (-0.81%)	⬇️

... and 78 files with indirect coverage changes

[mergify]

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

[SimFG]

/run-cpu-e2e

[xiaofan-luan]

/lgtm
/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SimFG, xiaofan-luan

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• internal/distributed/OWNERS [xiaofan-luan]
• internal/proxy/OWNERS [xiaofan-luan]
• internal/querycoordv2/utils/OWNERS [xiaofan-luan]

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