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

[pmalek]

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 KongRoutes between being service bound to control plane bound and vice versa.

[pmalek]

This could be done similarly as it has been done for Key and KeySet in #663