Make EventType Source Attribute Required

[karthikmurali60]

Fixes #7314

Proposed Changes

• Make source attribute required

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

Docs

[knative-prow]

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[knative-prow]

Hi @karthikmurali60. Thanks for your PR.

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[Cali0707]

/cc @pierDipi @matzew
Does an API chnage from optional -> required need an api version bump?

[Cali0707]

/retitle Make EventType Source Attribute Required

[matzew]

Hi, we are defining a new API for the EventType. A POC is herE:
#7313

This is the feature track:
https://docs.google.com/document/d/1hxCpQMI_qCy2CsHEv0nits4t65DExkizgg3KLvD4z2s/edit?resourcekey=0-ts4WNm_tlNYWuo9eWe1stA#heading=h.n8a530nnrb

In that doc we do discuss that attrs like source are required.

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