Remove the launch bar from the frontend of unpublished atomic sites

[youknowriad]

Related to Automattic/wp-calypso#96199
Equivalent to 169353-ghe-Automattic/wpcom but for atomic

This PR removes the launch bar entirely from atomic sites (like requested in the related issue).
It also makes a small change to wpcom-mu-plugin, it removes a reference to the DOM element of the bar even though that code was dead code anyway. (the global styles upsell not rendering in atomic at all)

Testing instructions:

• You need to build and sync wpcomsh plugin into your unpublished atomic test site.
• No launch bar is added to the frontend for logged-in users.

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

No

[github-actions]

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Wpcomsh plugin:

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

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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 update/remove-launch-bar-atomic 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 update/remove-launch-bar-atomic
  

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

[youknowriad]

The launch bar is now removed from simple site

[jorgefilipecosta]

Works well on the tests I did 👍