[release-1.19] Adjust queue proxy metric attributes

[knative-prow-robot]

This is an automated cherry-pick of #16049

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.14%. Comparing base (12709ea) to head (fca1b07).
⚠️ Report is 1 commits behind head on release-1.19.

Files with missing lines	Patch %	Lines
pkg/queue/sharedmain/otel.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.19   #16051      +/-   ##
================================================
- Coverage         80.20%   80.14%   -0.07%     
================================================
  Files               214      214              
  Lines             16888    16892       +4     
================================================
- Hits              13545    13538       -7     
- Misses             2984     2989       +5     
- Partials            359      365       +6     

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[dprotaso]

/lgtm
/approve

[knative-prow]

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