#6950343 Plans: Update styling for Jetpack CRM card to match other product cards

Resolves 1200412004370260-as-1201272180272104.
Relates to #57362.

Changes proposed in this Pull Request

• Split the JetpackCrmFreeCard component into two versions: one with, and one without, the price display.
• Add styling rules for the new displayed-price version of the CRM Free card to match other product cards.
• Add support for easier custom styling on the JetpackProductCard component.
• Add a property for abovePriceText on the JetpackProductCard component.
• Add support for the hideSavingLabel prop on free product price displays.

Testing instructions

NOTE: Please test this PR in both Calypso Blue and Calypso Green, for both wide and narrow screen layouts.

1. Visit the pricing page in any non-production environment.
2. Verify the product grid still renders correctly and flows naturally as the screen resizes.
3. Verify the Jetpack CRM Free card still shows up to the right of the VideoPress product card, and that its styles match the other product cards.
4. Verify the Jetpack CRM Free card’s price display and copy are aligned appropriately compared to other product cards.

Reference screenshots