Support for testing enable/disable dr

[nirs]

Split the channel and drpc from the subscription, so we can test deploying an app using OCM, and then enable and disable DR for the deployed application.

This will be used to add enable and disable DR flows to the ramen basic-test.

Tested with drenv regional-dr:

• [x] channel
• [x] subscription
• [x] busybox

Should be merged with https://github.com/RamenDR/ramen/pull/1080

[nirs]

I'll remove the testing commit in the next version, marking as draft until it is removed.

[nirs]

Code works, but the example kubectl command in the README is wrong.