Show the payment method terms on the checkout pages

[a-danae]

Changes proposed in this Pull Request:

• Pass the terms property for reusable payment method types
• Update the terms property according to whether the user is saving a payment method

Testing instructions

1. Change the store currency to EUR
2. Enable UPE, under the Stripe's settings tab
3. Enable Cards, Bancontact, SEPA, iDEAL, and Sofort
4. As a shopper, go to the classic checkout page
5. For each of these payment methods, confirm that:

• When "Save payment information to my account for future purchases" is checked off, the terms must be displayed
• When this input isn't checked, no terms must be displayed

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• Covered with tests (or have a good reason not to test in description ☝️)
• Added changelog entry in both changelog.txt and readme.txt (or does not apply)
• Tested on mobile (or does not apply)

Post merge

• Added testing instructions to the Release Testing Instructions wiki page (or does not apply)