[core] Add failing test for general `model.assign(...)` actions

[davidkpiano]

This PR demonstrates the failure for transitions to accept general model.assign(...) functions with the following characteristics:

1. Are defined outside of the machine definition
2. Can accept any event

Potentially addressed by https://github.com/statelyai/xstate/pull/2690

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[davidkpiano]

Should this be tackled in v5 instead, where we have better typings for actions?

[Andarist]

Since we phased out createModel API this is no longer needed and types are being reworked on anyway.