cmd/k8s-operator/e2e: run self-contained e2e tests with devcontrol (#17415)

* cmd/k8s-operator/e2e: run self-contained e2e tests with devcontrol

Adds orchestration for more of the e2e testing setup requirements to
make it easier to run them in CI, but also run them locally in a way
that's consistent with CI. Requires running devcontrol, but otherwise
supports creating all the scaffolding required to exercise the operator
and proxies.

Updates tailscale/corp#32085

Change-Id: Ia7bff38af3801fd141ad17452aa5a68b7e724ca6
Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>

* cmd/k8s-operator/e2e: being more specific on tmp dir cleanup

Signed-off-by: chaosinthecrd <tom@tmlabs.co.uk>

---------

Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>
Signed-off-by: chaosinthecrd <tom@tmlabs.co.uk>
Co-authored-by: chaosinthecrd <tom@tmlabs.co.uk>

cmd/k8s-operator/e2e/certs/pebble.minica.crt

@@ -0,0 +1,19 @@
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+-----END CERTIFICATE-----