Use WPAdmin view for Posts Listing

[getdave]

Fixes Automattic/wp-calypso#95621

Proposed changes:

• Replaces Calypso Post listing view with the WP Admin equivalent

Other information:

• Have you written new tests for your changes, if applicable?
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Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• Click Posts.
• You should see the WPAdmin view for Posts as opposed to the Calypso version.

Screenshots

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WordPress.com Simple site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin, and enable the try/use-wp-admin-for-posts-listing branch.

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  bin/jetpack-downloader test jetpack-mu-wpcom-plugin try/use-wp-admin-for-posts-listing
  

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[github-actions]

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[getdave]

Looks like clicking on Add New Post is going to WPAdmin and not Calypso URL. This seems to break things in my testing.

Looking at WP Core I don't see any way to filter that URL.

[getdave]

Looks like there is prior art on this in pdtkmj-3dx-p2. I can probably close this one out right @mmtr?

[mmtr]

@getdave Yes, you can close this one out. it's already implemented and part of the (not-started-yet) experiment that we'll use to rollout these changes.