Enable storage of EventType v1b2

[dsimansk]

Based on Slack thread: https://cloud-native.slack.com/archives/C04LMU33V1S/p1705560044668329.

Proposed Changes

• Enable storage of EventType v1b2

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

Enable storage of EventType `v1beta2` instead of `v1beta1`

[codecov]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (7cba45b) 74.52% compared to head (d30fa58) 74.44%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
pkg/broker/filter/filter_handler.go	13.33%	11 Missing and 2 partials ⚠️
pkg/channel/fanout/fanout_event_handler.go	71.79%	7 Missing and 4 partials ⚠️
pkg/broker/ingress/ingress_handler.go	40.00%	1 Missing and 2 partials ⚠️
pkg/channel/event_receiver.go	40.00%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7594      +/-   ##
==========================================
- Coverage   74.52%   74.44%   -0.08%     
==========================================
  Files         262      262              
  Lines       14970    15041      +71     
==========================================
+ Hits        11157    11198      +41     
- Misses       3223     3243      +20     
- Partials      590      600      +10     

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[dsimansk]

/test upgrade-tests

[dsimansk]

/test reconciler-tests

[dsimansk]

@pierDipi @matzew I would say it's good for the review now with update tests passing. PTAL

Hence the test setup changes are required for proper update sequence with version migration.

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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