Icu 6896 upgrade ember data (#1511)

* chore: 🤖 Upgrade ember data to 3.28.12

✅ Closes: ICU-6896

addons/api/addon/models/base.js

@@ -54,6 +54,10 @@ export default class BaseModel extends Model {
     const id = this.scopeID;
     return this.store.peekRecord('scope', id);
   }
+
+  // Ember seems to have a bug with its internals and can't correctly set
+  // the `scopeModel` when passed in as part of the `inputProperties`
+  // of a `createRecord` call
   set scopeModel(model) {
     if (model) {
       const json = model.serialize();
@@ -92,7 +96,6 @@ export default class BaseModel extends Model {
   /**
    * @type {boolean}
    */
-  @computed('hasDirtyAttributes', 'isSaving')
   get canSave() {
     return this.hasDirtyAttributes && !this.isSaving;
   }
@@ -100,7 +103,6 @@ export default class BaseModel extends Model {
   /**
    * @type {boolean}
    */
-  @computed('canSave')
   get cannotSave() {
     return !this.canSave;
   }