Perf app: investigate need for multiple Typescript loaders in Webpack config

[spmonahan]

Currently we use multiple Webpack loaders to process .ts/tsx files in our performance application. We do this because FAST Web Components do not build properly with babel-loader so we conditionally load them with ts-loader. Using ts-loader allows Web Components to correctly build but it's not ideal as our Webpack config is more complex.

Investigate this issue with the goal of loading all code via babel-loader.