fix(secondary-button): to prop-type

[tdeekens]

Summary

This pull request intends to clear up some confusion about the to prop-type.

Description

The linkTo-prop was recently being deprecated. In favour of using the as-prop with a paring of the to-prop. However, the linkTo prop either accepted a string of an object of { pathname, search, query } for the underlying react-router. The to-prop doesn't support this. This overall makes migrating to the to prop in internal apps not possible as far as I can tell. As a result I propose to accept the same shape on the to prop and forward it.

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[tdeekens]

Note, that this "blocks" a non-urgent internal PR. I would also silence the console there dependening on when the next release is planned 😸.

[jonnybel]

Makes sense, thanks!