Replace Calypso "Testimonials" and "Portfolio" with the corresponding wp-admin versions

[Copons]

Important

Project thread: pekYwv-4PY-p2
Tracked by #98483

As part of the Untangling Calypso epic, let's remove the custom implementation of the Testimonials and Portfolio views, in lieu of the corresponding wp-admin versions — for all users.

This will reduce confusion navigating between Calypso and proper WordPress admin.

Note: to enable Testimonials and Portfolio, head to Settings > Writing and toggle their options.

Requirements

• Selecting "Testimonials" from the WordPress or Calypso menu opens /wp-admin/edit.php?post_type=jetpack-testimonial.
• Adding a new Testimonial from the WordPress or Calypso menu opens /wp-admin/post-new.php?post_type=jetpack-testimonial.
• Selecting "Portfolio" from the WordPress or Calypso menu opens /wp-admin/edit.php?post_type=jetpack-portfolio.
• Adding a new Portfolio project from the WordPress or Calypso menu opens /wp-admin/post-new.php?post_type=jetpack-portfolio.
• Selecting "Portfolio > Project Types" from the WordPress or Calypso menu opens /wp-admin/edit-tags.php?taxonomy=jetpack-portfolio-type&post_type=jetpack-portfolio.
• Selecting "Portfolio > Project Tags" from the WordPress or Calypso menu opens /wp-admin/edit-tags.php?taxonomy=jetpack-portfolio-tag&post_type=jetpack-portfolio.

[mmtr]

• Adding a new Testimonial from the WordPress or Calypso menu opens /wp-admin/post-new.php?post_type=jetpack-testimonial.
• Adding a new Portfolio project from the WordPress or Calypso menu opens /wp-admin/post-new.php?post_type=jetpack-portfolio.

@Copons I think this should be part of the iframed editor removal, right?

[Copons]

@mmtr good point, yes. I'll remove them from the requirements for now.

[mmtr]

Closing this one out. There are two remaining tasks, but they are being handled on separate issues:

• Stats link is broken for Portfolio Projects: @BogdanUngureanu is preparing a fix for that as part of Replace Calypso "Posts" with the standard WordPress "Posts" view #95621, which will also fix the same issue for Posts (and presumably for Pages)
• We should show a notice the first time a user is enforced to the WP Admin view: Done in Remove duplicate views: Show notices jetpack#40609, will be shipped shortly (likely tomorrow).