🐛 Fixed page revision returning empty array on update and restore (#17042)

closes https://github.com/TryGhost/Team/issues/3491

- the `PostRevisionModel` had a `belongsTo` relation to Post which resulted in the Page model returning an empty array in the `post_revisions` property.
- Simply removing it fixed it. refs https://ghost.slack.com/archives/C02G9E68C/p1686912389383579?thread_ts=1686909240.034419&cid=C02G9E68C

ghost/admin/app/adapters/page.js

@@ -3,7 +3,15 @@ import ApplicationAdapter from 'ghost-admin/adapters/application';
 export default class Page extends ApplicationAdapter {
     // posts and pages now include everything by default
     buildIncludeURL(store, modelName, id, snapshot, requestType, query) {
-        return this.buildURL(modelName, id, snapshot, requestType, query);
+        const url = this.buildURL(modelName, id, snapshot, requestType, query);
+        const parsedUrl = new URL(url);
+
+        if (snapshot?.adapterOptions?.saveRevision) {
+            const saveRevision = snapshot.adapterOptions.saveRevision;
+            parsedUrl.searchParams.append('save_revision', saveRevision);
+        }
+
+        return parsedUrl.toString();
     }
 
     buildURL() {

ghost/admin/app/models/post-revision.js

@@ -1,7 +1,6 @@
 import Model, {attr, belongsTo} from '@ember-data/model';
 
 export default class PostRevisionModel extends Model {
-  @belongsTo('post') post;
   @attr('string') lexical;
   @attr('string') title;
   @attr('string') featureImage;