kcp e2e tests

[mjudeikis]

We now gonna support more agnostic backend (like kcp) after #295 merges.

We need to add dedicated tests for it into kcp/test/e2e to test kcp/README.md described flow to make sure we dont add regressions in our schema'less backend

[mjudeikis]

POC was done here: https://github.com/mjudeikis/kube-bind/pull/new/mjudeikis/kcp.test

[ntnn]

Assign to me please

[mjudeikis]

This was done as two days ago