Posts: Navigate max pages notice to /sites

[tyxla]

Proposed Changes

Updates PostTypeListMaxPagesNotice to no longer set layout focus to sites, but to rather navigate to the new sites selector on /sites.

I'm also using the opportunity to refactor the component to a functional one.

Why are these changes being made?

To remove one of the last instances where we're setting layout focus to sites, which unblocks us from removing the old site picker which we're not using almost anywhere anymore.

We're unifying site selection code as part of improving the multisite dashboard experience.

We're removing the old site picker in #101844 and we removed a few unused related pieces in #101835 and #101837.

Testing Instructions

• Make sure your remove_duplicate_views_experiment_assignment_160125 preference is set to control.
• Go to /posts
• If you don't have enough posts in that list, in React DevTools set PostTypeList's totalPageCount prop to 99 as shown on the screenshot:

• Verify that clicking the "switch to a specific site" link leads to /sites.

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-139005

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-139005&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-139005&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 update/post-type-list-max-pages-sites on your sandbox.

[matticbot]

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

Sections (~13 bytes removed 📉 [gzipped])

Details

name          parsed_size           gzip_size
posts-custom       -166 B  (-0.0%)      -13 B  (-0.0%)
posts              -166 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.

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.

[ciampo]

Code changes LGTM and test well as per instructions 🚀

On trunk, the site selector opens in the sidebar, while on this PR the page navigates to /sites.

[ciampo]

Glad we moved away from this