Boost + wpcomsh: ensure API endpoints are registered

[kraftbj]

Fixes HOG-87

Proposed changes:

• With wpcomsh running, My Jetpack is forced off unless the site owner has chosen the wp-admin interface.
• If a site has chosen Calypso or not chosen at all, My Jetpack does not init, which means the REST API endpoints are not registered.
• With Jetpack Boost, the CTA for upgrading relies on the My Jetpack products endpoint to provide information.
• With the API not available, the link to purchase the upgrade is malformed and not able to be purchased.

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:

• On a site with wpcomsh + Boost, before the patch, visit the Jetpack->Boost page and click the CTA to upgrade.
• Clicking on the CTA in the modal will take you to the WordPress.com checkout with an error.
• Try again with the patch.
• Purchase Boost!

[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 fix/hog-87 branch.

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]

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Follow this PR Review Process:

1. Ensure all required checks appearing at the bottom of this PR are passing.
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Wpcomsh plugin:

• Next scheduled release: Atomic deploys happen twice daily on weekdays (p9o2xV-2EN-p2)

If you have any questions about the release process, please ask in the #jetpack-releases channel on Slack.

[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/wpcomsh/class-jetpack-plugin-compatibility.php	0/66 (0.00%)	0.00%	3 ❤️‍🩹

Full summary · PHP report

[donnchawp]

Works as expected, thanks for fixing!