Social: Add 'Save to media library' button for SIG image

[manzoorwanijk]

Now that we're changing the logic around attached media, it's not possible to upload the SIG created image with the social post. As a work around, and a feature that could be useful for other reasons, it would be good to add a 'Save to media library' button, either in the sidebar, or in the SIG options modal, or both. This could then be selected as the attached media.

Proposed changes:

• Social: Add 'Save to media library' button for SIG image

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:

• On a site with the paid Social plan, goto post editor
• Turn ON "Enable Social Image"
• Confirm that you see the "Save to media library" button when the image is ready
• Click on the button
• Confirm that it shows, "Saving..." while the request is in progress
• Confirm that the image is successfully saved to the media library

https://github.com/Automattic/jetpack/assets/18226415/4cb4e5d7-5121-4f6a-bf33-d49438681cd2

[github-actions[bot]]

Thank you for your PR!

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[github-actions[bot]]

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/sig-save-to-media-library 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 update/sig-save-to-media-library

  bin/jetpack-downloader test jetpack-mu-wpcom-plugin update/sig-save-to-media-library

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

[manzoorwanijk]

Moved settings button to start