Admin bar: add subitems to the top-left WP.com icon menu

[fushar]

Related to:

• Untangle Admin Bar wp-calypso#98079

Proposed changes:

This PR adds the following to the top-left WordPress(.com) icon in the admin bar:

Simple	Atomic

• Brought back the menu items on hover.
• Add Sites and Domains items pointing to the global view.
• On Atomic, Brought back Core's About WordPress and Get Involved menu.
  • On Simple sites, those links are not valid / hidden by opers.

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

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

Testing instructions:

1. Patch this PR
2. Verify the changes in the WP icon as described above.

[github-actions]

Thank you for your PR!

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• 🔴 Add a "[Status]" label (In Progress, Needs Review, ...).
  
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The e2e test report can be found here. Please note that it can take a few minutes after the e2e tests checks are complete for the report to be available.

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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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[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 untangle-admin-bar-2 branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack-mu-wpcom-plugin untangle-admin-bar-2

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	0/180 (0.00%)	0.00%	34 💔

Full summary · PHP report

_{Coverage check overridden by I don't care about code coverage for this PR Use this label to ignore the check for insufficient code coveage. .}

[okmttdhr]

Worked as expected both on Simple & Atomic ✅