Make 2nd layer links optional in Menu components

[Ymirke]

Currently you get TS error if you don't supply links argument to menu links.

If you supply empty array you get a dropdown with the link item, and the dropdown is empty.

Same TS issue might apply to other menu components as well.

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[russellbanks]

This is also applicable to HeaderAction and HeaderMenuColored which would benefit from specifying nullability on sub-links.

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