Expose ValidatedInputControl via privateAPIs

[m1r0]

What?

Related to this discussion, this PR exposes the ValidatedInputControl component via the privateAPIs.

Why?

The ValidatedInputControl component has a suffix, which is something we need on a few forms on Calypso.

[github-actions]

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[github-actions]

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[m1r0]

@mirka @oandregal Because you have context, can you give it a quick look?

[mirka]

👍

[m1r0]

Looks like this was implemented in #71514. Closing...