multi: remove x/exp/maps dependency

[jjjike2021]

Change Description

Description of change / link to associated issue.
follow up:#9604

The original returned the keys in a slice, but when it became 'native' the signature changed to return an iterator, so the new idiom is slices.Collect(maps.Keys(theMap)), unless of course the raw iterator can be used instead.

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[guggero]

Thanks, LGTM 🎉

[yyforyongyu]

Can you perform a rebase on master to rerun the CI?

[jjjike2021]

Can you perform a rebase on master to rerun the CI?

rebased

[yyforyongyu]

LGTM