Fix: Use correct readyness check in AuthZ conformance tests

[creydr]

Fix to use the correct readyness check in the AuthZ e2e tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.45%. Comparing base (bf945f9) to head (0a3c370).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #8167       +/-   ##
=========================================
+ Coverage      0   67.45%   +67.45%     
=========================================
  Files         0      371      +371     
  Lines         0    18001    +18001     
=========================================
+ Hits          0    12142    +12142     
- Misses        0     5086     +5086     
- Partials      0      773      +773     

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[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, pierDipi

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