Removes the deprecated DeadLetterChannel in ChannelableStatus

[vishal-chdhry]

Signed-off-by: Vishal Choudhary sendtovishalchoudhary@gmail.com

Fixes #388
Context:

• Removes the deprecated DeadLetterChannel in ChannelableStatus knative/eventing#6722
• Get rid of the deprecated DeadLetterChannel in ChannelableStatus knative/eventing#6720

Proposed Changes

• 🗑️ Remove feature or internal logic
• removes deprecated DeadLetterChannel

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

removes deprecated DeadLetterChannel in favor of DeliveryStatus

Docs

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Vishal-Chdhry
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[knative-prow]

Welcome @vishal-chdhry! It looks like this is your first PR to knative-sandbox/eventing-natss 🎉

[knative-prow-robot]

PR needs rebase.

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