List applying policies in Sequence .status.policies

[creydr]

As the Eventing Authorization feature track describes, target resources of EventPolicies, will reflect in their status, which EventPolicy is applied to them.

For example:

apiVersion: flows.knative.dev/v1
kind: Sequence
metadata:
  name: my-sequence
spec:
  ...
status:
  ...
  policies:
    - name: event-policy
      apiVersion: v1alpha1
    - name: another-event-policy
      apiVersion: v1alpha1

  conditions:
    - type: Ready
      status: "True"
    - type: EventPoliciesReady
      status: "True"

As the Sequence should support EventPolicies, wee need to do the following:

• Update the Sequence reconciler to show applying policies in the Sequence .status.policies and set the Sequence EventPoliciesReady condition. Also watch EventPolicies for changes.
• Set EventPoliciesReady condition to true, in case no policy applies, and set message according to the default-authorization-mode (e.g. Default authorization mode is 'allow-all'). Check the Default Authorization Mode section in the feature track for additional information.

Hint:

• Adding AppliedEventPoliciesStatus to the Sequence is done in Add AppliedEventPoliciesStatus type #7975

Prerequisites:

• Add Library to support on AuthZ #7985
• Add AppliedEventPoliciesStatus type #7975

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1. When the issue has the Draft status, the issue is subject to change and thus should not be started to be worked on
2. Make sure you've read and understood the CONTRIBUTING.md guidelines
3. Make sure you're able to run Knative Eventing locally and run at least the unit tests.
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[7h3-3mp7y-m4n]

hey, this is a great opportunity for me to contribute further in this project, and I would love to work on this.
I see there are lot of issues already listed in the prerequisite so I would like to give it a try.

[rahulii]

/assign