Update ModuleNotFoundPlugin to support Webpack 5

Created by: raix

Support both "SingleEntryPlugin" and "EntryPlugin"

ref: https://webpack.js.org/blog/2020-10-10-webpack-5-release/#minor-changes

Part of making way for Webpack 5 #9994 (closed)

yarn docker:e2e --test-suite simple not tested - but done manual QA*