Jetpack AI: remove default style parameter from jetpack-ai-image requests

[CGastrell]

Proposed changes:

Stop sending a default style parameter on image (featured and general) generation requests. The default is handled on backend and we'll need the parameter to be optional yet deliberate once we implement the styles.

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)?

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

No

Testing instructions:

Sandbox public-api.

Without checking out the branch, I recommend you trigger an image generation from our usual 3 spots:

• logo block
• image block
• featured image sidebar

Then checkout the branch, build/watch both js-packages/ai-client and plugins/jetpack, then reload and repeat the 3 generation requests (same prompts).

Observe:

• while non-deterministic, images should look similar between the 2 generations (meaning the lack of style parameter didn't change anything)
• check the requests (jetpack-ai-image) payloads to see the style parameter is not present on the requests

[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 remove/jetpack-ai-image-generator-style-parameter branch.

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

  bin/jetpack-downloader test jetpack remove/jetpack-ai-image-generator-style-parameter
  

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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The e2e test report can be found here. Please note that it can take a few minutes after the e2e tests checks are complete for the report to be available.

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Follow this PR Review Process:

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Jetpack plugin:

The Jetpack plugin has different release cadences depending on the platform:

• WordPress.com Simple releases happen semi-continuously (PCYsg-Jjm-p2).
• WoA releases happen weekly.
• Releases to self-hosted sites happen monthly. The next release is scheduled for October 1, 2024 (scheduled code freeze on September 30, 2024).

If you have any questions about the release process, please ask in the #jetpack-releases channel on Slack.

[lhkowalski]

Working as expected:

Feature	Before	After
Featured Image
General Image
Logo (style was not there in the first place)

Did not notice any change on the quality/style of the generated images, so the backend is handling properly the default style.