MM-26753 Create initial sidebar categories on demand if migration hasn't ran (#14981)

* MM-26753 Change CreateInitialSidebarCategories to only take a user ID

* MM-26753 Create initial sidebar categories on demand if migration hasn't ran

* Wait for sidebar categories to be loaded in case of replication lag

i18n/en.json

@@ -6210,18 +6210,6 @@
     "id": "searchengine.bleve.disabled.error",
     "translation": "Error purging Bleve indexes: engine is disabled"
   },
-  {
-    "id": "sidebar.category.channels",
-    "translation": "Channels"
-  },
-  {
-    "id": "sidebar.category.dm",
-    "translation": "Direct Messages"
-  },
-  {
-    "id": "sidebar.category.favorites",
-    "translation": "Favorites"
-  },
   {
     "id": "store.insert_error",
     "translation": "insert error"