Refactor phetioEngine elements to be broadcasted on a different (eager) channel onPhetioInitialized; remove workarounds, https://github.com/phetsims/phet-io/issues/1712
Refactor phetioEngine elements to be broadcasted on a different (eager) channel onPhetioInitialized; remove workarounds, https://github.com/phetsims/phet-io/issues/1712

phetsims/chipper,phetsims/chipper,phetsims/chipper