In a previous change, we throw an error if we encounter an unknown sharding when saving shardings for instructions. However, this ingored the fact that we deliberately replace some module parameter/root shardings with unknown sharding objects. This CL makes the condition tigher so we only throw an error when we encounter unknown sharding objects intended for shard_as or shard_like annotations, which was the original intention anyway.

In a previous change, we throw an error if we encounter an unknown sharding when saving shardings for instructions. However, this ingored the fact that we deliberately replace some module parameter/root shardings with unknown sharding objects. This CL makes the condition tigher so we only throw an error when we encounter unknown sharding objects intended for shard_as or shard_like annotations, which was the original intention anyway. #7726