Resolve multi-path alias for webpack

Problem to solve

Add multi-path alias support in webpack.config.js makes it possible to resolve path follow the order below:

jh => ee => ce

Proposal

if (IS_JH) {
  Object.assign(alias, {
    jh: path.join(ROOT_PATH, 'jh/app/assets/javascripts'),
    jh_component: path.join(ROOT_PATH, 'jh/app/assets/javascripts'),
    jh_empty_states: path.join(ROOT_PATH, 'jh/app/views/shared/empty_states'),
    jh_icons: path.join(ROOT_PATH, 'jh/app/views/shared/icons'),
    jh_images: path.join(ROOT_PATH, 'jh/app/assets/images'),
    jh_jest: path.join(ROOT_PATH, 'jh/spec/frontend'),
    jh_else_ce: path.join(ROOT_PATH, 'jh/app/assets/javascripts'),
    jh_else_ee: [
        path.join(ROOT_PATH, 'jh/app/assets/javascripts'),
        path.join(ROOT_PATH, 'ee/app/assets/javascripts'),
        path.join(ROOT_PATH, 'app/assets/javascripts'),
    ],
  });
}