Load local images directly into KIND cluster

Currently, images can only be run in a local KIND cluster if they are pushed to a remote registry first, as described in the Build and Test Guide. Users should be able to load images directly into the KIND cluster such that they do not need to push to a container registry before running the cluster.

Acceptance criteria

• On :start_service or :start_backend, the relevant images are built from source and loaded into the kind cluster
• The user does not need to push to a container registry to validate images
• If necessary, the user can :load_images to update which images are being used