Add KinD test that verifies that the source deploys successfully and starts sending events.

## Overview

We recently found that even though build and unit tests had been passing, the receive adapter panicked when it started when you actually deployed the sample source. To address this, we should add a KinD test job that will:
1. Install eventing and the sample source
2. Create a sample source
3. Verify that events are delivered

## More info

These resources will likely be helpful while working on this:
- https://github.com/knative/eventing/blob/main/.github/workflows/kind-e2e.yaml
- https://github.com/knative-extensions/reconciler-test
- https://github.com/knative/eventing/tree/main/test/rekt

Start with .github/workflows/kind-e2e.yaml in Knative Eventing and the reconciler-test and test/rekt resources linked in the issue. Define a KinD test job that installs Eventing and the sample source, creates a sample source, and verifies that events are delivered successfully.

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