Clean up barrel type failure

Author: wycats

packages/ember/barrel.ts

@@ -192,10 +192,6 @@ namespace Ember {
   export type ActionHandler = InternalActionHandler;
   export const Comparable = InternalComparable;
   export type Comparable = InternalComparable;
-
-  // This syntax is namespace-specific: `import` in a namespace is aliasing one
-  // namespace to another, while `export` marks the item public on the namespace
-  // (as with the rest of the exported items).
   export const RSVP = _RSVP;
   export type RSVP = typeof _RSVP;
 
@@ -748,11 +744,4 @@ defineEmberTestingLazyLoad('setupForTesting');
 // @ts-expect-error Per types, runLoadHooks requires a second parameter. Should we loosen types?
 applicationRunLoadHooks('Ember');
 
-// the special "export import" syntax above doesn't actually transpile correctly
-// under all build configurations. It seems to work if you're simultaneously
-// transpiling ESM to AMD but breaks when keeping ESM output.
-//
-// This is a workaround to ensure that the runtime is actually included.
-Ember.RSVP = _RSVP;
-
 export default Ember;