Since it appears in the same bubble as the rest of the LLM's response text, make it more human readable so it doesn't look out of place.
PiperOrigin-RevId: 822729061
Previously BuiltInCodeExecutor was missing the logic to save output files from executed code as artifacts, so images/visualizations wouldn't show up in the UI. This fix will iterate through all parts of the LlmResponse, and if any of them are images, it will save the image data using artifact_service (similar to what is done in VertexAICodeExecutor).
This fixes the backend, but there are still UI bugs that should be fixed -- events without content are currently ignored, so the image doesn't appear even though it is saved. We will add the UI fix in a separate change.
PiperOrigin-RevId: 822245140
Kathy WuandCopybara-Service