Jetpack AI Image: Automatically start generation of featured image when there is content on the post

[lhkowalski]

This is reverting part of #38098 so we only trigger the generation automatically when there is content on the post. When there is no content, the user will see the modal open with the empty state on it.

Proposed changes:

• Enable featured image auto start when there is content on the post

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

p1720141077573849-slack-C054LN8RNVA

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

Testing instructions:

Let's test the first scenario: no content on the post.

• Run this branch on your testing site (or a fresh JN site)
• Go to the block editor and do not add any content
• Look for the featured image button on the Jetpack sidebar (Jetpack sidebar > AI Assistant section > AI Featured Image > Generate Image)
• Click the button and confirm the tool will open, the generation will not start and you see the proper empty state:

• Do the same test for the other 2 placements:
  • Settings sidebar > Post tab > AI Assistant section > AI Featured Image > Generate Image button
  • Settings sidebar > Post tab > Featured Image section (or summary section, depending on the Gutenberg version) > Set featured image button
  • Remember to not add content to the post while testing it and confirm you only see the modal showing the empty state, with no generation going on
• Confirm you still can type some prompt and generate images based on it

Now let's test the second scenario: a post with content.

• Add some content to the post (tip: use the AI Assistant to generate two paragraphs about some topic)
• Look for the featured image button on the Jetpack sidebar (Jetpack sidebar > AI Assistant section > AI Featured Image > Generate Image)
• Click the button and confirm the tool will open and the generation will start automatically
• You should see a loading state and then, after some time, the new generated image:

The loading state	The generated image

• Close the generation tool and do the same test for the other 2 placements:
  • Settings sidebar > Post tab > AI Assistant section > AI Featured Image > Generate Image button
  • Settings sidebar > Post tab > Featured Image section (or summary section, depending on the Gutenberg version) > Set featured image button
  • Confirm you see the modal with the loading state, followed by the new image being showed
• Confirm you still can type a custom prompt and generate images based on it, after the first one got generated

[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/jetpack-ai-featured-image-auto-start-generation branch.

• To test on Simple, run the following command on your sandbox:

  bin/jetpack-downloader test jetpack update/jetpack-ai-featured-image-auto-start-generation
  

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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• ✅ Add a "[Status]" label (In Progress, Needs Team Review, ...).
  
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Once your PR is ready for review, check one last time that all required checks appearing at the bottom of this PR are passing or skipped.
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The Jetpack plugin has different release cadences depending on the platform:

• WordPress.com Simple releases happen daily.
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[CGastrell]

LGTM! Works as described