cannot `GetSnapshot` or `CloneSnapshot` for `GenericSnapshot`

[kdorosh]

this line of code always throws an interface panic https://github.com/solo-io/solo-kit/blob/v0.24.2/pkg/api/v1/control-plane/cache/generic_snapshot.go#L134

we need to fix it so we can test / validate generic snapshot marshalling

resolving this will require updates to the base Resource interface and perhaps sweeping changes across codegen

[kdorosh]

also highly relevant to this part of the code https://bryanftan.medium.com/accept-interfaces-return-structs-in-go-d4cab29a301b

[kdorosh]

this codepath is never currently called hence why it has not been an issue, but if we ever start getting snapshots in the ratelimit or extauth translator syncers then this code will panic