[TASK]: Replace calibrate loss chart with vegalite chart

[mwdchang]

The current loss chart was quickly put together and is a bit out of place with the themes and designs of terarium, we should look at replacing it with the other charts we have.

We have createForecastChart function in services/chart.js that should be a sufficient replacement for the loss chart. I think we can just plug in the "summary-layer" and that should do the trick.