FORNO-74: External Media – Add filter for including additional sources in media sources dropdown

[t-wright]

Proposed changes:

• Introduces a filter jetpack.externalMedia.extraMediaSources which allows adding additional media sources to the media button sources dropdown.
• Checks whether the ai-featured-image-generator extension is available before rendering the Generate with AI button as a featured image media button source.

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

Context for this change can be found in Linear FORNO-74

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

No

Testing instructions:

• Run bin/jetpack-downloader test jetpack forno-74/add/extra-media-sources-filter on your sandbox
• Open the post editor
• Add an image block
• Click on the Set featured image button and verify that the existing options are available
• Set the ai-featured-image-generator feature to unavailable window.Jetpack_Editor_Initial_State.available_blocks['ai-featured-image-generator'].available = false;
• Click on the Set featured image button and verify the Generate with AI option is no longer shown
• Add the filter. E.g.

wp_add_inline_script(
	'wp-blocks',
	'wp.hooks.addFilter( "jetpack.externalMedia.extraMediaSources", "myplugin", ( value, args ) => {
		return [{
			id: "myplugin-extra-source",
			label: "My Source",
			icon: "admin-site",
			onClick: () => {
				const image = { id: 123, url: "https://example.com/image.jpg" }; // update this with an actual image attachment
				args.onSelect( args.multiple ? [ image ] : image );
			}
		}];
	} );'
);

• Add an image block and click Select Image
• Verify My Source appears in the list and clicking it adds the image to the block

[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 (Jetpack), and enable the forno-74/add/extra-media-sources-filter branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack forno-74/add/extra-media-sources-filter

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!

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• ✅ 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 🤖

---

Follow this PR Review Process:

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[jp-launch-control]

Code Coverage Summary

This PR did not change code coverage!

That could be good or bad, depending on the situation. Everything covered before, and still is? Great! Nothing was covered before? Not so great. 🤷

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