StepContainerV2: Use Gutenberg breakpoints

[zaguiini]

Why are these changes being made?

Consistency and ease of development.

Testing Instructions

No regressions compared to production should be introduced.

Test all steps in onboarding and site-setup, including user registration, and compare them to production.

Test that the loading component (in-between screens, before flow) is centered on the screen as well.

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-138843

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-138843&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-138843&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 (~108 bytes removed 📉 [gzipped])

name                   parsed_size           gzip_size
entry-stepper               -392 B  (-0.0%)     -108 B  (-0.0%)
entry-subscriptions          -98 B  (-0.0%)       +7 B  (+0.0%)
entry-main                   -98 B  (-0.0%)       +7 B  (+0.0%)
entry-login                  -98 B  (-0.0%)       +7 B  (+0.0%)
entry-domains-landing        -98 B  (-0.0%)       +7 B  (+0.0%)
entry-browsehappy            -98 B  (-0.0%)       +7 B  (+0.0%)

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

Sections (~96 bytes removed 📉 [gzipped])

name                        parsed_size           gzip_size
signup                           -824 B  (-0.3%)      -24 B  (-0.0%)
async-step-unified-plans         -824 B  (-0.1%)      -23 B  (-0.0%)
async-step-unified-domains       -824 B  (-0.1%)      -21 B  (-0.0%)
checkout                         -128 B  (-0.0%)      -28 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 (~252 bytes removed 📉 [gzipped])

name                                             parsed_size           gzip_size
async-load-signup-steps-domains                       -257 B  (-0.0%)     -105 B  (-0.1%)
async-load-signup-steps-plans-theme-preselected       -154 B  (-0.0%)      -57 B  (-0.0%)
async-load-signup-steps-plans                         -154 B  (-0.0%)      -62 B  (-0.0%)
async-load-calypso-blocks-editor-checkout-modal       -128 B  (-0.0%)      -28 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.

[matticbot]

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

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

• help-center
• notifications

To test WordPress.com changes, run install-plugin.sh $pluginSlug step-container-v2/use-gutenberg-breakpoints on your sandbox.