Add support for OIDC in eventshub receiver

[creydr]

As the Eventing OIDC feature track describes, we need to add e2e tests to test the OIDC implementation.
Therefore, eventshub in knative-sandbox/reconciler-test should support:

• Receiving authenticated requests and verify their token. If the token is invalid, the receiver should respond with status code 401

Additional Info

• eventhub's sender component: https://github.com/knative-sandbox/reconciler-test/blob/main/pkg/eventshub/receiver/receiver.go
• Requries Provide a library for OIDC token management #7175
• Relates to Add support for OIDC in eventshub sender #7333