Improved training detail pages

When you kick off a training process to fine-tune your own model, there's a page you can visit to view the status of the training, as well as the inputs and outputs. We've made some recent improvements to those pages:

1. The header now shows the base model and destination model you used when fine-tuning.
2. Metadata about the training job is now diplayed above the inputs and outputs to make it easier to see the important details without having to scroll down the page.
3. We've added code snippets you can copy and paste to run your new fine-tuned model.