Checkout variants show introductory offers for three-year plans in an inconsistent way

[DavidRothstein]

This was noticed by @renatho here: pdxWSz-1Mt-p2

Example:

It seems like maybe the checkout variant code was never updated for three year plans.

Can we relax or even partially remove the following restriction?

wp-calypso/client/my-sites/checkout/src/components/item-variation-picker/variant-dropdown-price.tsx

Lines 80 to 83 in ff94a75

	//generic introductory offer to catch unexpected offer terms
	if (
	( introTerm !== 'month' && introTerm !== 'year' ) ||
	( introCount > 2 && introTerm === 'year' )

Hopefully an easy fix.

[michaeldcain]

From planning:

Moving this to the inbox to maybe get picked up as a Quick Fix. If it's not, I'll move it to the backlog tomorrow.