[WIP] Add test to verify post-install jobs succeeded

[pierDipi]

As per title

[knative-prow]

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[pierDipi]

/cherry-pick release-1.15

[pierDipi]

/cherry-pick release-1.14

[knative-prow-robot]

@pierDipi: once the present PR merges, I will cherry-pick it on top of release-1.15 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.15

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[knative-prow-robot]

@pierDipi: once the present PR merges, I will cherry-pick it on top of release-1.14 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.14

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.25%. Comparing base (961961c) to head (ff20fbf).
Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4015   +/-   ##
=======================================
  Coverage   48.25%   48.25%           
=======================================
  Files         246      246           
  Lines       14540    14540           
=======================================
  Hits         7016     7016           
  Misses       6817     6817           
  Partials      707      707           

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[knative-prow]

@pierDipi: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
upgrade-tests_eventing-kafka-broker_main	ff20fbf	link	true	/test upgrade-tests
reconciler-tests_eventing-kafka-broker_main	ff20fbf	link	true	/test reconciler-tests
reconciler-tests-namespaced-broker_eventing-kafka-broker_main	ff20fbf	link	true	/test reconciler-tests-namespaced-broker

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[Cali0707]

@pierDipi we probably want to change the target branch for this PR to 1.15 now that #4018 is merged

Edit: nevermind, I understand now why we are testing this - it is good to keep this in case they fail in the future too. My bad!

[knative-prow-robot]

PR needs rebase.

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[Cali0707]

@pierDipi could you rebase this?