remove sources v1alpha2 APIs

[lionelvillard]

Fixes #

Proposed Changes

• Remove all core source v1alpha2 APIs

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

:wastebasket  Remove APIServerSource, ContainerSource, PingSource and SinkBinding v1alpha2 APIs

Docs

/hold needs to coordinate with Client WG. @maximilien @rhuss @navidshaikh

[codecov]

Codecov Report

Merging #5318 (b9789c5) into main (474fb5b) will decrease coverage by 0.52%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5318      +/-   ##
==========================================
- Coverage   83.56%   83.04%   -0.53%     
==========================================
  Files         233      211      -22     
  Lines        6674     6292     -382     
==========================================
- Hits         5577     5225     -352     
+ Misses        762      737      -25     
+ Partials      335      330       -5     

Impacted Files	Coverage Δ
pkg/broker/filter/filter_handler.go	85.81% <0.00%> (+5.40%)	⬆️

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[lionelvillard]

@maximilien @rhuss @navidshaikh AFAIK, kn still relies on v1alpha2 source APIs. We are dropping them in 0.23 so this change will break knative/client

[lionelvillard]

We are also dropping v1beta1 APIs

[rhuss]

/unhold

@lionelvillard thanks for the heads up ! Let's unhold and merge so that we increase the pressure a bit on the client side ;-P

Background why the client always chooses the oldest available API: kn favours backwards compatibility (i.e a newer client can work with an older cluster) over forward compatibility (i.e. an older client can work with a newer cluster).

[vaikas]

I'm working on the downstream tests failure for rabbitmq. I understand somebody else is working on the kafka failures?

[vaikas]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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