E2E Test Cleanup

[SgtCoDFish]

The current e2e test runner hasn't been updated for some time, and has several issues:

1. Old versions being tested
2. Limited ability to vary tested Kubernetes / cert-manager versions
3. In-script implementations of dependency provisioning (better to use make / makefile modules)
4. e2e Suite is a regular go test with no compile flags, so go test ./... in the root of the repo fails

The minimum we should do is bump the versions being used, but it'd be worth changing this more widely. Binary dependencies (kubectl, etc) can be provisioned in make, and the gold standard would be for the kind cluster to be created in Go code when the test is set up.

[SgtCoDFish]

There's also an error being printed in logs:

ERROR: unknown flag: --name

(taken from this test output)