[release-1.20] Generate test certs dynamically [skip-dot-release]

[knative-prow-robot]

This is an automated cherry-pick of #9009

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 83 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.16%. Comparing base (1935c13) to head (5315699).
⚠️ Report is 1 commits behind head on release-1.20.

Files with missing lines	Patch %	Lines
...entingtls/eventingtlstesting/eventingtlstesting.go	0.00%	83 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.20    #9011      +/-   ##
================================================
+ Coverage         51.11%   51.16%   +0.04%     
================================================
  Files               409      409              
  Lines             21348    21343       -5     
================================================
+ Hits              10913    10920       +7     
+ Misses             9586     9575      -11     
+ Partials            849      848       -1     

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[dprotaso]

/retest