Sites Dashboard: Add migration status to site header

[m1r0]

Resolves #95589
Based on #95497

Proposed Changes

• When the migration status is "pending", updates the site title to "Incoming Migration", changes to icon, and adds the "migration pending" status in the site header.
• Fixes the site title being updated to "Incoming Migration" when the migration status is "started". In the design, it's updated only when the status is "pending".

Testing Instructions

• Have a blog with the "pending" migration status.
• Go to /sites, click on the blog, and make sure the site heading has the "Incoming Migration" title, custom icon, and the "migration pending" status added to it.

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 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)?

[matticbot]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-122687

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-122687&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-122687&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

• notifications
• wpcom-block-editor

To test WordPress.com changes, run install-plugin.sh $pluginSlug add/migration-status-to-site-header on your sandbox.

[matticbot]

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

App Entrypoints (~211 bytes added 📈 [gzipped])

name           parsed_size           gzip_size
entry-stepper       +499 B  (+0.0%)     +211 B  (+0.0%)
entry-main          +499 B  (+0.0%)     +211 B  (+0.0%)
entry-login         +283 B  (+0.0%)     +133 B  (+0.0%)

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

Sections (~1829 bytes removed 📉 [gzipped])

name                parsed_size           gzip_size
hosting                 +2879 B  (+0.2%)    +1508 B  (+0.3%)
hosting-features         +266 B  (+0.0%)     +206 B  (+0.1%)
site-monitoring          +157 B  (+0.0%)      +52 B  (+0.0%)
site-logs                +157 B  (+0.0%)      +52 B  (+0.0%)
github-deployments       +157 B  (+0.0%)      +59 B  (+0.0%)
settings                 +133 B  (+0.0%)      +50 B  (+0.0%)
staging-site              -37 B  (-0.0%)     +144 B  (+0.0%)
sites-dashboard           +24 B  (+0.0%)      +13 B  (+0.0%)
site-performance          +24 B  (+0.0%)      +13 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 (~50 bytes added 📈 [gzipped])

name                                       parsed_size           gzip_size
async-load-calypso-layout-command-palette       +133 B  (+0.1%)      +50 B  (+0.1%)

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.

[m1r0]

This fixes the site title being updated to "Incoming Migration" when the migration status is "started". In the design, it's updated only when the status is "pending".