[WIP] Fetch receiver report directly by Prober

[mgencur]

Fixes #6045

Proposed Changes

• do not use FinishedSleep before fetching the report but rather wait for the report to be complete/inactive or eventually time out
• fetch the test report by prober directly from receiver
• remove wathola-fetcher and its image

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

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[codecov]

Codecov Report

Merging #6055 (1f9953a) into main (2d64fdd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #6055   +/-   ##
=======================================
  Coverage   82.32%   82.32%           
=======================================
  Files         225      225           
  Lines        7636     7636           
=======================================
  Hits         6286     6286           
  Misses        910      910           
  Partials      440      440           

---

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[knative-prow-robot]

@mgencur: 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
pull-knative-eventing-upgrade-tests	1f9953a	link	true	/test pull-knative-eventing-upgrade-tests
pull-knative-eventing-integration-tests	1f9953a	link	true	/test pull-knative-eventing-integration-tests

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[cardil]

Getting rid of fetcher isn't a good idea. Fetcher was introduced, because of collecting logs directly, turned to be problematic on all those Kubernetes distros. It should be working on OpenShift, GKE, Minikube, and Kind, at least.

See #4460

[mgencur]

Thanks, closing this. Will create another PR with simpler solution, keeping Fetcher.