Jetpack AI: trim title and content before triggering featured image generation

[CGastrell]

Proposed changes:

Make sure content and title are not just empty spaces to decide on triggering featured image generation

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

p8oabR-1Bq-p2#comment-8338

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

No

Testing instructions:

Open the editor and use post sidebar's "Set featured image" -> "Generate with AI". As title and post are empty, it should not trigger an image generation. Close the modal, add spaces either on title or some paragraph and open the Featured Image modal again. It should still not trigger any generation. Close it again and now add some title to the post. Open the modal once more and see that it has now triggered an image generation based on the title.

[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 fix/jetpack-ai-featured-image-trigger-emtpy branch.

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

  bin/jetpack-downloader test jetpack fix/jetpack-ai-featured-image-trigger-emtpy
  

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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Jetpack plugin:

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[mwatson]

Works as described! 🚀