feat(checkout): CHECKOUT-8281 Add 3 New Checkout Extension Regions

[bc-peng]

What?

Add 3 new checkout extension regions.

Depends on

https://github.com/bigcommerce/checkout-sdk-js/pull/2567

Why?

New business requirement.

Testing / Proof

Manual testing

The extension region after the summary section

It will appear at the bottom of the page on the mobile view.

@bigcommerce/team-checkout

The selected shipping method region

It will only show up in the single shipping mode

https://github.com/bigcommerce/checkout-js/assets/88361607/01bc83cd-f6de-4d58-baa9-89edeb704c6e

[bc-0dp]

Oh yes! @bc-peng moar!!!

[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: e.find is not a function apply(@bigcommerce/checkout-sdk/packages/core/s... View Issue
• ‼️ TypeError: e.find is not a function. (In 'e.find((function(e){return e.region===t}))', 'e.find' is undefined) apply(@bigcommerce/checkout-sdk/packages/core/s... View Issue

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