Use mt-broker-filter as the Audience of a Triggers Subscriptions Subscriber

[creydr]

Fixes #7292

Proposed Changes

• 🎁 Use mt-broker-filter as the Audience of a Triggers Subscriptions Subscriber (pointing to the broker-filter)

[creydr]

When I create a Trigger, I get the following Subscription:

apiVersion: messaging.knative.dev/v1
kind: Subscription
metadata:
  ...
  name: github-my-trigger-03d5dd38-9210-424c-b98c-32f8e0b0e7f6
  namespace: default
  ownerReferences:
  - apiVersion: eventing.knative.dev/v1
    blockOwnerDeletion: true
    controller: true
    kind: Trigger
    name: my-trigger
    uid: 03d5dd38-9210-424c-b98c-32f8e0b0e7f6
spec:
  channel:
    apiVersion: messaging.knative.dev/v1
    kind: InMemoryChannel
    name: github-kne-trigger
  delivery:
    backoffDelay: PT0.2S
    backoffPolicy: exponential
    retry: 10
  reply:
    ref:
      apiVersion: eventing.knative.dev/v1
      kind: Broker
      name: github
      namespace: default
  subscriber:
    audience: mt-broker-filter
    uri: http://broker-filter.knative-eventing.svc.cluster.local/triggers/default/my-trigger/03d5dd38-9210-424c-b98c-32f8e0b0e7f6
status:
  ...
  physicalSubscription:
    replyAudience: eventing.knative.dev/broker/default/github
    replyUri: http://broker-ingress.knative-eventing.svc.cluster.local/default/github
    subscriberAudience: mt-broker-filter
    subscriberUri: http://broker-filter.knative-eventing.svc.cluster.local/triggers/default/my-trigger/03d5dd38-9210-424c-b98c-32f8e0b0e7f6

/assign @pierDipi @vishal-chdhry

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6915382) 77.50% compared to head (2a373f2) 77.51%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7319   +/-   ##
=======================================
  Coverage   77.50%   77.51%           
=======================================
  Files         250      250           
  Lines       13566    13569    +3     
=======================================
+ Hits        10515    10518    +3     
  Misses       2525     2525           
  Partials      526      526           

Files	Coverage Δ
pkg/reconciler/broker/trigger/trigger.go	83.96% <100.00%> (+0.18%)	⬆️

... and 2 files with indirect coverage changes

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[creydr]

/retest

[creydr]

/cc @pierDipi

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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