#145 Follow Up: Update the e2e testing to work when the `UnpackImageRegistryClient` feature-gate is enabled

[everettraven]

Following #145 , we should update the e2e testing to work even when the UnpackImageRegistryClient feature-gate is enabled. Currently the e2e tests rely on using kubelet to fetch images that have been loaded onto the cluster already via kind. We either need to replicate this behavior in the ImageRegistry source or use a custom image registry for e2e tests (this is the first thing that came to my head - very much so open to other suggestions).

Acceptance Criteria

• e2e tests pass when the UnpackImageRegistryClient feature-gate is enabled