drop cert-manager from downstream tests

[dprotaso]

This repo was archived when we moved the functionality into the serving controller

[dprotaso]

/assign @skonto @Fedosin @dsimansk

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.59%. Comparing base (05e18ff) to head (444d96d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3187      +/-   ##
==========================================
+ Coverage   75.53%   75.59%   +0.05%     
==========================================
  Files         192      192              
  Lines       11164    11164              
==========================================
+ Hits         8433     8439       +6     
+ Misses       2475     2471       -4     
+ Partials      256      254       -2     

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, dsimansk

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[dsimansk]

/test unit-tests