Domains: Add 100-Year Domain specific Thank You page

[rafaelgallani]

Proposed Changes

Adds changes to the existing components so that a specific copy/button is displayed for the 100-year domain thank you page (post-checkout page).

Why are these changes being made?

These changes are related to the 100-Year Domain UX update project: pcYYhz-2q8-p2.

Testing Instructions

• Build this branch locally or go to its calypso.live link;
• Enable store sandbox so no actual purchase is performed during the tests;
• Go to /setup/hundred-year-domain and choose any domain available;
• Complete the checkout and ensure you see the same as in the screenshot below - as opposed to the previous generic "thank you" page.

Preview

Before	After

Pre-merge Checklist

• [X] Has the general commit checklist been followed? (PCYsg-hS-p2)
• [ ] Have you written new tests for your changes?
• [ ] Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• [X] Have you checked for TypeScript, React or other console errors?
• [ ] Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• [ ] Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
• [ ] For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions[bot]]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-125308

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-125308&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-125308&env=a8c-for-agencies

[matticbot]

Here is how your PR affects size of JS and CSS bundles shipped to the user's browser:

Sections (~337 bytes added 📈 [gzipped])

``` name parsed_size gzip_size checkout +1453 B (+0.1%) +337 B (+0.1%) ``` Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Legend

What is parsed and gzip size?

**Parsed Size:** Uncompressed size of the JS and CSS files. This much code needs to be parsed and stored in memory. **Gzip Size:** Compressed size of the JS and CSS files. This much data needs to be downloaded over network.

Generated by performance advisor bot at iscalypsofastyet.com.

[matticbot]

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

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

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/checkout-100-year-domains-thank-you on your sandbox.