Apply updated coloring / syntax highlighting to diff view of JSON tree

[tonyanziano]

Currently, the diff view of the JSON tree when looking at bot state traces defaults to mono-colored key-value pairs, where only the diffed lines are different colors:

We believe that this is leftover styling from the dendrogram view, and we want to make it look more like the default view with separately colored key-value pairs:

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@mewa1024 If you have an idea for a color scheme, I can work with you to get it implemented and see if everything looks right.