webpack plugin compilation ignores all but main index.js entry
script/plugin_webpack_directories.rb#L28 supports plugins to have multiple 'bundles/entries' of assets, however during production compilation, these extra bundles are ignored:
Refs #25882 - Load additional plugin chunks
When loading the manifest.json from a plugin we need to include plugin
bc486dd62734be908cd3f95da1352cc1944eb34b attempted to make it possible
to create additional bundles. 202c65d0efc0345b883ba6d1e70aedc90b3d5294
then configured webpack to actually compile the bundle during build.
This completes the chain by loading it in the actual manifest so you can
use it in a production build where the development server isn't present.