Jetpack AI: Switch tracking data to snake_case to maintain Tracks' required property format

[mwatson]

Fixes #

Proposed changes:

• Changing camelCase properties to snake_case as required by Tracks

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:

• With the thumbs up/down component enabled, go to any AI generated item (or generate your own)
• Open the developer console and click a thumb. Verify that the data sent contains properties named media_library_id and revised_prompt and not their previous camelCase versions.

[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 change/jetpack-ai-fix-tracks-fields branch.

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

  bin/jetpack-downloader test jetpack change/jetpack-ai-fix-tracks-fields
  

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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[dhasilva]

LGTM