Use contenthash instead of chunkhash for better long-term caching #6387
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This changes the .js webpack file name values to use
contenthashinstead ofchunkhashas recommended by the webpack team:webpack/webpack.js.org#2096
https://webpack.js.org/guides/caching/#output-filenames
This should improve long-term caching for our users by relying only on the contents of the .js file itself instead of the chunk as a whole (.js, .css, etc) to generate the filename.