Auto open "Upload Theme" dialog when wpcom-upload=1 param exists

[DustyReagan]

Fixes Automattic/wp-calypso#93594

Proposed changes:

• This PR opens the "Upload Theme" dialog by default on /wp-admin/theme-install.php when wpcom-upload=1 is included as URL paramter

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?

No.

Testing instructions:

• Load this PR using the instructions in the comment below.
• Go to /wp-admin/theme-install.php?wpcom-upload=1
• The upload dialog should be open. Click the "Upload Theme" button to toggle it close.
• Go to /wp-admin/theme-install.php
• The upload dialog should be closed. Click the "Upload Theme" button to toggle it open.

[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 add/auto-open-upload-theme 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 add/auto-open-upload-theme
  

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]

Thank you for your PR!

When contributing to Jetpack, we have a few suggestions that can help us test and review your patch:

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[dsas]

Nice one, works for me.