Admin Bar: The admin bar links to Hosting Dashboard, if that is the preference

[p-jackson]

Fixes DOTDASH-400

Proposed changes:

Checks the Calypso preferences when rendering the admin bar.
If the user has opt'd in to the Hosting Dashboard, the (W) links will point to the Hosting Dashboard.

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

This is testable, but I don't know how we can merge this ahead of time 🤔 Site front ends don't have the equivalent of wpcalypso that we can deploy to.

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

No

Testing instructions:

• Use wpcalypso.wordpress.com/me/account to opt-in/out of the hosting dashbaord
• Deploy this change to your sandbox
• Sandbox your test site
• Load the test site front end and confirm the (w) links in the top-left point to the correct place.

[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:

• ✅ Include a description of your PR changes.
  
• ✅ Add a "[Status]" label (In Progress, Needs Review, ...).
  
• ✅ Add a "[Type]" label (Bug, Enhancement, Janitorial, Task).
  
• ✅ Add testing instructions.
  
• ✅ Specify whether this PR includes any changes to data or privacy.
  
• ✅ Add changelog entries to affected projects
  

This comment will be updated as you work on your PR and make changes. If you think that some of those checks are not needed for your PR, please explain why you think so. Thanks for cooperation 🤖

---

Follow this PR Review Process:

1. Ensure all required checks appearing at the bottom of this PR are passing.
2. Make sure to test your changes on all platforms that it applies to. You're responsible for the quality of the code you ship.
3. You can use GitHub's Reviewers functionality to request a review.
4. When it's reviewed and merged, you will be pinged in Slack to deploy the changes to WordPress.com simple once the build is done.

If you have questions about anything, reach out in #jetpack-developers for guidance!

[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 WoA dev 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 (WordPress.com Site Helper), and enable the DOTDASH-400-top-bar-links-to-v2 branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack-mu-wpcom-plugin DOTDASH-400-top-bar-links-to-v2

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

[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/packages/jetpack-mu-wpcom/src/features/wpcom-admin-bar/wpcom-admin-bar.php	61/289 (21.11%)	21.11%	-64 💚

Full summary · PHP report

[p-jackson]

I've marked as "do not merge" because this doesn't feel safe to merge for a12s—or anyone who has opt'd in to the hosting dashboard.

Until the dashboard/v2 feature flag is enabled on production, this link will be broken.