Update `AutoEmulate` to check if passed `model_params` are compatible with emulator

[sgreenbury]

As mentioned in #918, it would be good to update here to only include params that are in the model's init signature.

This would ensure that model_params can be passed but will use defaults for incompatible models rather than raise exception.

We might want to revisit whether to make model_tuning a bool flag for clearer control too.

Originally posted by @radka-j in #918 (comment)