Support OIDC Identity Creation in Triggers

[Cali0707]

Problem
Currently, the trigger in EKB does not support OIDC Identity Creation. We should add this support.

Persona:
Which persona is this feature for?

Exit Criteria
A unit test for the trigger verifying that trigger.Status.OIDCIdentityCreated = true

Time Estimate (optional):
How many developer-days do you think this may take to resolve? 1

Additional context (optional)
Add any other context about the feature request here.

[Cali0707]

cc @creydr

[karkabbage]

/assign

[Cali0707]

@karkabbage this reference PR from where the same changes were made in eventing core might be helpful: knative/eventing#7299

Please note that a lot of the changes there are already included in eventing kafka broker (such as all of the new functions in trigger_lifecycle.go, so you won't have to re-implement that part. The main changes you will have to make will be in trigger.go and controller.go in control-plane/pkg/reconciler/trigger, as well as updating the associated unit tests (in trigger_test.go and controller_test.go)

If you have any questions, don't hesitate to ping me!

[creydr]

I oversaw/didn't remember this, when I created #3521 and added it to the OIDC project.
Will close this, as the other has already a PR open.
Sorry for the confusion