drop http01 from downstream testing

[dprotaso]

This is deprecated - knative/serving#14640

[knative-prow]

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[dprotaso]

/assign @izabelacg

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9f033a7) 81.80% compared to head (e3e4b17) 81.82%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2968      +/-   ##
==========================================
+ Coverage   81.80%   81.82%   +0.02%     
==========================================
  Files         167      167              
  Lines       10231    10231              
==========================================
+ Hits         8369     8372       +3     
+ Misses       1614     1612       -2     
+ Partials      248      247       -1     

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[izabelacg]

/lgtm