make sure the mtchannelbasedbroker uses trigger.spec.delivery

[n3wscott]

Fixes #5266

Proposed Changes

• 🐛 Propagate trigger.spec.delivery to subscriptions for MTChannelBasedBroker.

Release Note

Bug fix: Propagate trigger.spec.delivery to subscriptions for MTChannelBasedBroker.

[codecov]

Codecov Report

Merging #5267 (8c7c2fc) into main (71153e6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5267   +/-   ##
=======================================
  Coverage   83.34%   83.34%           
=======================================
  Files         243      243           
  Lines        6879     6882    +3     
=======================================
+ Hits         5733     5736    +3     
  Misses        797      797           
  Partials      349      349           

Impacted Files	Coverage Δ
pkg/reconciler/broker/trigger/trigger.go	80.45% <100.00%> (+0.45%)	⬆️

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[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/broker/trigger/trigger.go	86.1%	86.4%	0.4

[n3wscott]

related to #4515
related to #4654

[vaikas]

/lgtm

[knative-prow-robot]

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