97183 Workaround: reorder admin sidebar sections

The issue described at https://github.com/DSpace/dspace-angular/issues/1643 was
no longer reproducible: The menu component ultimately retrieves menu section
information from the store, but in the `MenuComponent#ngOnInit` method, this
information is piped through `distinctUntilChanged(compareArraysUsingIds())`,
which discards an update that sets these menu elements to be visible.

The behavior of this pipe is probably incorrect, but a proper fix is out of
scope for the current task. For now, we work around the problem by adding
top-level menu sections _after_ their children while initializing the menu
section store, which side-steps this issue.

src/app/menu.resolver.ts

@@ -171,17 +171,6 @@ export class MenuResolver implements Resolve<boolean> {
     ]).subscribe(([isCollectionAdmin, isCommunityAdmin, isSiteAdmin]) => {
       const menuList = [
         /* News */
-        {
-          id: 'new',
-          active: false,
-          visible: true,
-          model: {
-            type: MenuItemType.TEXT,
-            text: 'menu.section.new'
-          } as TextMenuItemModel,
-          icon: 'plus',
-          index: 0
-        },
         {
           id: 'new_community',
           parentID: 'new',
@@ -232,6 +221,17 @@ export class MenuResolver implements Resolve<boolean> {
             link: '/processes/new'
           } as LinkMenuItemModel,
         },
+        {
+          id: 'new',
+          active: false,
+          visible: true,
+          model: {
+            type: MenuItemType.TEXT,
+            text: 'menu.section.new'
+          } as TextMenuItemModel,
+          icon: 'plus',
+          index: 0
+        },
         // TODO: enable this menu item once the feature has been implemented
         // {
         //   id: 'new_item_version',
@@ -246,17 +246,6 @@ export class MenuResolver implements Resolve<boolean> {
         // },
 
         /* Edit */
-        {
-          id: 'edit',
-          active: false,
-          visible: true,
-          model: {
-            type: MenuItemType.TEXT,
-            text: 'menu.section.edit'
-          } as TextMenuItemModel,
-          icon: 'pencil-alt',
-          index: 1
-        },
         {
           id: 'edit_community',
           parentID: 'edit',
@@ -296,6 +285,17 @@ export class MenuResolver implements Resolve<boolean> {
             }
           } as OnClickMenuItemModel,
         },
+        {
+          id: 'edit',
+          active: false,
+          visible: true,
+          model: {
+            type: MenuItemType.TEXT,
+            text: 'menu.section.edit'
+          } as TextMenuItemModel,
+          icon: 'pencil-alt',
+          index: 1
+        },
 
         /* Statistics */
         // TODO: enable this menu item once the feature has been implemented