Remove duplicate views: Show notices

[mmtr]

Fixes Automattic/wp-calypso#97400

Proposed changes:

Displays a notice when a user visits the enforced WP Admin view of a removed Calypso screen for the first time.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

N/A

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

No

Testing instructions:

• Go to the placeholder experiment page: 22124-explat-experiment
• Assign yourself to the treatment variation using the bookmarklets
• Visit any of the screens that are currently enforcing the WP Admin view:
  • Posts > All Posts
  • Posts > Tags
  • Posts > Categories
  • Portfolio > All Projects
  • Testimonials > All Testimonials
• Make sure a notice shows up correctly
• Make sure the notice does not show up in all the following scenarios:
  • Already dismissed
  • When visiting the WP Admin view if your admin interface was already set to wp-admin (i.e. untangled)
  • When visiting the WP Admin view if your preferred view is classic (i.e. tangled classic)
  • When visiting the WP Admin view while being assigned to the control variation

[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 update/remove-duplicate-views-notices branch.

  • For jetpack-mu-wpcom changes, also add define( 'JETPACK_MU_WPCOM_LOAD_VIA_BETA_PLUGIN', true ); to your wp-config.php file.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/remove-duplicate-views-notices
  

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2

[github-actions]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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• ✅ Add testing instructions.
  
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• ✅ Add changelog entries to affected projects
  

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