Remove sources v1beta1

[lionelvillard]

/hold Depends on #5318

Proposed Changes

• Remove all core source v1beta1 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 v1beta1 APIs

Docs

[codecov]

Codecov Report

Merging #5319 (ce24412) into main (c2d6649) will decrease coverage by 0.59%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5319      +/-   ##
==========================================
- Coverage   82.95%   82.36%   -0.60%     
==========================================
  Files         211      189      -22     
  Lines        6291     5902     -389     
==========================================
- Hits         5219     4861     -358     
+ Misses        742      720      -22     
+ Partials      330      321       -9     

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[lionelvillard]

/unhold

[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew

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