Konnect entities: implement migration from serviceless `KongRoute` (control plane bound) to service bound and vice versa.

### Problem statement

#665 tracks the implementation of serviceless `KongRoute`.

This issue tracks the implementation of migration from serviceless `KongRoute` to service bound and vice versa.

### Notes



### Acceptance criteria

- [ ] KGO can migrate `KongRoute`s between being service bound to control plane bound and vice versa.
