v3.13.0-beta.4

CHANGELOG

• #18278 [BUGFIX] Bump ember-router-generator from v1.2.3 to v2.0.0 to support parsing app/router.js with native class.
• #18291 [BUGFIX] Adds the babel-helpers injection plugin back and include ember-template-compiler in the vendor folder for Ember.
• #18296 [BUGFIX] Ensure {{each-in}} can iterate over keys with periods
• #18304 [BUGFIX] Check the EMBER_ENV environment variable after it is set