Enhancement: stream output to UI

[vsoch]

Currently, we are able to "stream" the log to the interface by way of cutting it short given that it's still running. However, this creates a small pause before the page loads that isn't ideal.

For this feature request, we would want to transform the loading of data from the view into an endpoint, and have the page load first, and then a small waiting icon to spin for the same amount of time, and then load the (partial) log into the page. I only have so much bandwidth for javascript in a day, so probably won't get to it today (and indeed there are other things I think that are higher priority than a slight UI optimization, but I do want to note it because it's important to ultimately fix).