Integration tests with 2 kind clusters

1. Configure 2 kind clusters, and ensure the controller features works across them
2. Inject AWS creds into the controlller docker as env variables
3. Use separate namespace for each run to ensure multiple it can run in parallel

The issue does not name files or existing tests, so start by locating the integration-test entry point and the controller's Docker configuration. Review how kind clusters, AWS credentials, and namespaces are currently handled. Done means integration tests exercise two clusters, use injected credentials, and can run concurrently with separate namespaces.

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