[HACK] AI API keys: Extract content gen prompts and add test coverage #16138
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HACK week. Part of #15372
Description
As part of the project to grant merchants the ability to use their own AI solutions for product generation, we need to expand and reuse the
GenerativeContentRemote, which at the moment has the AI prompting explicitly defined inside the remotes.This PR extracts these prompts, moves them to a separate data struct, and add a test suite to assure future accuracy.
The PR can be tested as stand-alone improvement with the current Jetpack AI implementation without using the AI API key feature.
Testing information