Merge commit 'c9ea91f8683cd5c0cfac14071a17e3956ac6d3b0' into glitch-soc/merge-upstream

Conflicts:
- `spec/requests/api/v1/timelines/tag_spec.rb`:
  Upstream refactored this file, while we had a change to switch a default setting.
  Updated as upstream did.
- `spec/views/statuses/show.html.haml_spec.rb`:
  Upstream refactored this file, while we stubbed different methods.
  Updated as upstream did, and updated the stubs accordingly.

config/routes/api.rb

@@ -346,7 +346,7 @@ namespace :api, format: false do
   end
 
   namespace :v2_alpha do
-    resources :notifications, only: [:index, :show] do
+    resources :notifications, param: :group_key, only: [:index, :show] do
       collection do
         post :clear
         get :unread_count
@@ -355,6 +355,8 @@ namespace :api, format: false do
       member do
         post :dismiss
       end
+
+      resources :accounts, only: [:index], module: :notifications
     end
   end