Admin bar: ensure the Atomic debug bar is the leftmost menu

[fushar]

Fixes:

• Masterbar: Restore the position of the Atomic debug menu to the left wp-calypso#94472

Proposed changes:

This PR ensures that the debug bar on Automattician's Atomic sites (under proxy) is the leftmost menu, similar to where it was before the "Nav Redesign".

One rationale is to avoid "masterbar jumps" when switching between Atomic and Simple sites.

Before

After

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. Prepare an Atomic site with Jetpack Beta Tester.
2. Patch this PR.
3. Go to /wp-admin while proxied; verify that the Debug bar is on the left.
4. Go to /wp-admin while not proxied; verify that the Debug bar not there and everything still works.
5. Test on site frontend as well.

[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 Team Review, ...).
  
• ✅ 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 🤖

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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 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 debug-bar-left 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 debug-bar-left
  

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

[taipeicoder]

✅ Go to /wp-admin while proxied; verify that the Debug bar is on the left.

✅ Go to /wp-admin while not proxied; verify that the Debug bar not there and everything still works.

✅ Test on site frontend as well.