Fix DeadLetterSink on Trigger status

[benmoss]

I mistakenly hadn't added it to the CRD, so it was just getting dropped by the apiserver as an unknown field.

Semi-fixes #5639, I think there still remains the problem that Broker doesn't have a status.deadLetterSinkUri as referenced by the spec

Proposed Changes

• 🐛 Fix DeadLetterSinkURI not persisting to Trigger status

Release Note

:page_facing_up: Fix DeadLetterSinkURI not persisting to Trigger status

[codecov]

Codecov Report

Merging #5642 (16b7086) into main (c183833) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5642   +/-   ##
=======================================
  Coverage   82.73%   82.73%           
=======================================
  Files         200      200           
  Lines        6266     6266           
=======================================
  Hits         5184     5184           
  Misses        750      750           
  Partials      332      332           

Impacted Files	Coverage Δ
pkg/apis/eventing/v1/trigger_types.go	100.00% <ø> (ø)
pkg/reconciler/broker/trigger/trigger.go	82.31% <100.00%> (ø)

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[lionelvillard]

/approve
/lgtm
/hold

may want to coordinate with downstream repos to fix the build breakage. /cc @pierDipi @aliok

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: benmoss, lionelvillard

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[benmoss]

/hold cancel

spoke to @pierDipi and it sounds like we can just merge, I'll PR to fix downstreams