Domains Management Revamp: Add email plans comparison subpage

[phcp]

Closes #97815

Proposed Changes

• Add Email Plans Comparison subpage.
• Fix vertical scrolling for subpages.
• Update tests.

Why are these changes being made?

• This is part of the Domain Management Revamp project: pfuQfP-13x-p2

Testing Instructions

• Apply this PR to your local
• Go to http://calypso.localhost:3000/domains/manage?flags=calypso/all-domain-management
• Click on a domain that doesn't have emails configured
• Click on the Email tab
• Click on "See how they compare" link
• The plans comparison page should be rendered with the new layout
• Select one of the email plans
• It should return to the Email overview page with the correct plan expanded
• Go back to the plans comparison page
• Switch to Monthly plans and select a different plan
• It should return to the Email overview page with the correct interval selected and the plan expanded
• Go to the old UI and perform the same tests (WP Admin -> Hosting -> Email)
• The page should work as before, without changes on visual or behavior

Pre-merge Checklist

• 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)?
• 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 UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• 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]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-73852deb6e236d05aeabf6b9f635e5d8394a4f86

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-73852deb6e236d05aeabf6b9f635e5d8394a4f86&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:commit-73852deb6e236d05aeabf6b9f635e5d8394a4f86&env=a8c-for-agencies

[matticbot]

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

App Entrypoints (~41 bytes added 📈 [gzipped])

name                   parsed_size           gzip_size
entry-main                  +118 B  (+0.0%)      +24 B  (+0.0%)
entry-login                 +118 B  (+0.0%)      +24 B  (+0.0%)
entry-domains-landing       +118 B  (+0.0%)      +20 B  (+0.0%)

Common code that is always downloaded and parsed every time the app is loaded, no matter which route is used.

Sections (~92 bytes added 📈 [gzipped])

name                  parsed_size           gzip_size
domains                    +796 B  (+0.0%)      +77 B  (+0.0%)
update-design-flow         +118 B  (+0.0%)      +15 B  (+0.0%)
link-in-bio-tld-flow       +118 B  (+0.0%)      +15 B  (+0.0%)
copy-site-flow             +118 B  (+0.0%)      +15 B  (+0.0%)
email                       +81 B  (+0.0%)      +10 B  (+0.0%)

Sections contain code specific for a given set of routes. Is downloaded and parsed only when a particular route is navigated to.

Async-loaded Components (~54 bytes added 📈 [gzipped])

name                                                                              parsed_size           gzip_size
async-load-signup-steps-page-picker                                                    +118 B  (+0.0%)      +17 B  (+0.0%)
async-load-signup-steps-domains                                                        +118 B  (+0.0%)      +15 B  (+0.0%)
async-load-purchase-modal-wrapper                                                      +118 B  (+0.0%)      +17 B  (+0.0%)
async-load-my-sites-checkout-purchase-modal-is-eligible-for-one-click-checkou...       +118 B  (+0.0%)      +17 B  (+0.0%)
async-load-calypso-my-sites-checkout-modal                                             +118 B  (+0.0%)      +22 B  (+0.0%)

React components that are loaded lazily, when a certain part of UI is displayed for the first time.

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.

[ouikhuan]

Tested and works as expected! 🚢