If certificate files change after start, use the latest keypair, not the
keypair originally present at startup.

Move E2E helper and utility functions to dedicated files.

Move several all-in-one tests that weren't in the correct category to
feature tests.

Support override images that include the Docker repository when the
Docker repository includes a port. Instead of requiring the image string
split have exactly 2 items, use the last item as the tag and join the
rest back together

The Action registry is not exposed to the KIND network, so we cannot
actually use it. Load the image directly into KIND instead.

Co-authored-by: Shane Utt <shaneutt@linux.com>