CIAB: add woo-hosted setup flow

[michaeldcain]

Fixes: https://linear.app/a8c/issue/SHILL-929/ciab-create-checkout-flow-for-ciab

Proposed Changes

This adds a setup flow for CIAB sites, with domains and CIAB plans steps, that takes the user to Checkout when complete.

Why are these changes being made?

When a CIAB site is provisioned with a free trial, the user will be prompted to upgrade their site through a Stepper flow.

To Do:

• Calypso Products: add CIAB products #106517
• CIAB: update Checkout for Woo Hosted sites #106584
• Checkout: fix introductory offer monthly calculation #106588
• Fix "downgrade" CTA on plans page
• Update features for plans comparison
• Fix Checkout redirect

Testing Instructions

• Visit calypso.localhost:3000/setup/woo-hosted?siteSlug={yourciabsiteaddress}
• Verify that you can add a domain to the cart
• Verify that you're taken to the plans page with CIAB "Basic" and "Pro" plans (feature list is placeholder right now)
• Verify that selecting a plan takes you to Checkout
• Verify that completing Checkout redirects you to your CIAB site

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-160095

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-160095&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-160095&env=a8c-for-agencies

[matticbot]

This PR modifies the release build for the following Calypso Apps:

For info about this notification, see here: PCYsg-OT6-p2

• happy-blocks
• help-center
• notifications
• odyssey-stats
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/woo-hosted-setup-flow on your sandbox.