drop old usage of knative.dev/pkg/tracing

[dprotaso]

/assign @dsimansk

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.28%. Comparing base (95b1ace) to head (ec00edc).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15982      +/-   ##
==========================================
+ Coverage   80.24%   80.28%   +0.03%     
==========================================
  Files         214      214              
  Lines       16904    16904              
==========================================
+ Hits        13565    13571       +6     
+ Misses       2975     2972       -3     
+ Partials      364      361       -3     

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[Cali0707]

/lgtm
/approve

[knative-prow]

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