fix(DropdownMenu): Support enabling 'exactOptionalPropertyTypes'

[eranhirsch]

When exactOptionalPropertyTypes is enabled for the project, we get the error:

Type '{ children: (ReactNode | Element)[]; slot?: string | undefined; style?: CSSProperties | undefined; title?: string | undefined; dir?: string | undefined; ... 280 more ...; checked: CheckedState | undefined; }' is not assignable to type 'DropdownMenuCheckboxItemProps' with 'exactOptionalPropertyTypes: true'. Consider adding 'undefined' to the types of the target's properties.
  Types of property 'checked' are incompatible.
    Type 'CheckedState | undefined' is not assignable to type 'CheckedState'.
      Type 'undefined' is not assignable to type 'CheckedState'.ts(2375)

This happens because when exactOptionalPropertyTypes is enabled, we can't assign undefined to an optional prop.

I think this destructuring is redundant because the remaining props rest param would contain it and it would be typed accurately as an optional prop.

[vercel]

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