fix(combobox): modify MultiSelectComboboxProps.onSelectedItemsChange typing to reflect reality

[SethNuteTwilio]

The current typing for this prop is misleading and has caused some confusion on the Segment side of the house. From my code comment, the true behavior of the callback function here is as follows:

* If `state` prop is passed, `UseMultiSelectPrimitiveStateChange<Item>` is the type for the `newSelectedItems` callback param
*
* If `state` prop isn't passed, `any[]` is the type for the `newSelectedItems` callback param

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🦋 Changeset detected

Latest commit: d989545

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@twilio-paste/combobox	Patch

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[YiyangLi]

[nkrantz]

Hey @SethNuteTwilio, can you share a reproduction of the type error? Just want to review before we get this change in. Sorry it's taken so long to get to this, team capacity is very low right now!