Upgrade samples to webpack 5 or other build tools

[bossanovaorca]

hello, I attempted to use the ui-react-starter template, but I discovered it was using webpack v4 which does not play nice with sass/sass-loader. when i attempted to upgrade webpack, the build time increased over 10x and often the builds would not even complete, they would just hang indefinitely. are there any plans to update these templates to support more recent dev dependency versions?