remove string constant from global

Author: rondale-sc

packages/ember-glimmer/lib/index.ts

@@ -304,4 +304,4 @@ export { UpdatableReference } from './utils/references';
 export { default as iterableFor } from './utils/iterable';
 export { default as DebugStack } from './utils/debug-stack';
 export { default as OutletView } from './views/outlet';
-export { isSerializationFirstNode, SERIALIZATION_FIRST_NODE_STRING } from './utils/serialization-first-node-helpers';
+export { isSerializationFirstNode } from './utils/serialization-first-node-helpers';

packages/ember-glimmer/lib/utils/serialization-first-node-helpers.ts

@@ -1 +1 @@
-export { isSerializationFirstNode, SERIALIZATION_FIRST_NODE_STRING } from '@glimmer/util';
+export { isSerializationFirstNode } from '@glimmer/util';

packages/ember/lib/index.js

@@ -429,8 +429,7 @@ import {
   isHTMLSafe,
   getTemplates,
   setTemplates,
-  isSerializationFirstNode,
-  SERIALIZATION_FIRST_NODE_STRING
+  isSerializationFirstNode
 } from 'ember-glimmer';
 
 Ember.Component = Component;
@@ -504,8 +503,7 @@ Ember.ViewUtils = {
   getViewBoundingClientRect: views.getViewBoundingClientRect,
   getRootViews: views.getRootViews,
   getChildViews: views.getChildViews,
-  isSerializationFirstNode: isSerializationFirstNode,
-  SERIALIZATION_FIRST_NODE_STRING: SERIALIZATION_FIRST_NODE_STRING
+  isSerializationFirstNode: isSerializationFirstNode
 };
 
 Ember.TextSupport = views.TextSupport;