Remove deprecated components

[pierDipi]

The deprecated consolidated and distributed KafkaChannel implementations have been removed.
Automatic migration from the consolidated KafkaChannel is provided as part of the eventing-kafka-broker implementation.

The deprecated single tenant KafkaSource implementations has been removed.
Automatic migration from the single tenant KafkaSource implementation is provided as part of the eventing-kafka-broker implementation.

Proposed Changes

• Remove channels and st source

Release Note

The deprecated consolidated and distributed `KafkaChannel` implementations have been removed.
Automatic migration from the consolidated `KafkaChannel` is provided as part of the eventing-kafka-broker implementation.

The deprecated single tenant KafkaSource implementations has been removed.
Automatic migration from the single tenant KafkaSource implementation is provided as part of the eventing-kafka-broker implementation.

[codecov]

Codecov Report

Merging #1327 (7a122e5) into main (32592eb) will decrease coverage by 6.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1327      +/-   ##
==========================================
- Coverage   74.93%   68.21%   -6.73%     
==========================================
  Files         128       39      -89     
  Lines        9017     2369    -6648     
==========================================
- Hits         6757     1616    -5141     
+ Misses       2029      673    -1356     
+ Partials      231       80     -151     

see 20 files with indirect coverage changes

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[pierDipi]

/cc @matzew @aliok @creydr

[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
integration-test-channel-consolidated_eventing-kafka_main	7a122e5	link	true	/test integration-test-channel-consolidated
integration-test-channel-consolidated-sasl_eventing-kafka_main	7a122e5	link	true	/test integration-test-channel-consolidated-sasl
integration-test-channel-distributed_eventing-kafka_main	7a122e5	link	true	/test integration-test-channel-distributed

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[pierDipi]

Removed the unnecessary jobs in knative/test-infra#3795

[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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