Run channel Rekt tests

[aliok]

Fixes #

Proposed Changes

• Run channel Rekt tests
• cloudevents tag was required to run Rekt tests for KafkaChannel but was forgotten
• Depends on Revert channel parts of #1720 #1824. It is to revert the breakage merged unnoticed because of the conformance tests not running.

Release Note

:gift: KafkaChannel becomes conformant with spec. Conformance tests are now run with every code change.

Docs

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-sandbox-eventing-kafka-broker-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
control-plane/pkg/reconciler/channel/channel.go	69.8%	69.8%	-0.0

[codecov]

Codecov Report

Merging #1825 (c29af95) into main (862e933) will decrease coverage by 0.08%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1825      +/-   ##
============================================
- Coverage     66.53%   66.44%   -0.09%     
  Complexity      614      614              
============================================
  Files           134      134              
  Lines          5687     5687              
  Branches        178      178              
============================================
- Hits           3784     3779       -5     
- Misses         1600     1604       +4     
- Partials        303      304       +1     

Flag	Coverage Δ
java-unittests	82.01% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
control-plane/pkg/prober/prober.go	60.00% <0.00%> (-15.00%)	⬇️
control-plane/pkg/prober/cache.go	95.23% <0.00%> (-4.77%)	⬇️

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[pierDipi]

/test pull-knative-sandbox-eventing-kafka-broker-upgrade-tests

[pierDipi]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[pierDipi]

=== RUN   TestBrokerDeletedRecreated/broker_deleted_and_recreated/Assert/[Stable/MUST]test_broker_after_deletion
=== CONT  TestBrokerDeletedRecreated/broker_deleted_and_recreated/Assert/[Stable/MUST]test_broker_after_deletion
    event_info_store.go:72: Store added to the EventListener, which has already seen 15 events
2022/02/01 15:20:53 new files in /tmp/processed_yaml811421402
I0201 15:20:53.003383   50761 manifest.go:62] Reading YAML filepath: /tmp/processed_yaml811421402 recursive: false
2022/02/01 15:20:53 Created:
2022/02/01 15:20:53 {Subscription test-wxjggsyx subscription-0008-umgaqrpc  messaging.knative.dev/v1  }
=== CONT  TestBrokerDeletedRecreated/broker_deleted_and_recreated/Assert/[Stable/MUST]test_broker_after_deletion

Possible fix: #1811

/test pull-knative-sandbox-eventing-kafka-broker-reconciler-tests

[aliok]

Possible fix: #1811

If this PR merges w/o that fix, let's merge.

[aliok]

/test pull-knative-sandbox-eventing-kafka-broker-integration-tests