FEATURE: Edit bookmark reminders from post and explicit delete button (#9455)

There is now an explicit "Delete Bookmark" button in the edit modal. A confirmation is shown before deleting.

Along with this, when the bookmarked post icon is clicked the modal is now shown instead of just deleting the bookmark. Also, the "Delete Bookmark" button from the user bookmark list now confirms the action.

Add a `d d` shortcut in the modal to delete the bookmark.

app/serializers/post_serializer.rb

@@ -51,7 +51,9 @@ class PostSerializer < BasicPostSerializer
              :bookmarked,
              :bookmarked_with_reminder,
              :bookmark_reminder_at,
+             :bookmark_id,
              :bookmark_reminder_type,
+             :bookmark_name,
              :raw,
              :actions_summary,
              :moderator?,
@@ -334,6 +336,14 @@ class PostSerializer < BasicPostSerializer
     include_bookmarked_with_reminder?
   end
 
+  def include_bookmark_name?
+    include_bookmarked_with_reminder?
+  end
+
+  def include_bookmark_id?
+    include_bookmarked_with_reminder?
+  end
+
   def post_bookmark
     return nil if !SiteSetting.enable_bookmarks_with_reminders? || @topic_view.blank?
     @post_bookmark ||= @topic_view.user_post_bookmarks.find { |bookmark| bookmark.post_id == object.id }
@@ -348,6 +358,14 @@ class PostSerializer < BasicPostSerializer
     Bookmark.reminder_types[post_bookmark.reminder_type].to_s
   end
 
+  def bookmark_name
+    post_bookmark&.name
+  end
+
+  def bookmark_id
+    post_bookmark&.id
+  end
+
   def include_display_username?
     SiteSetting.enable_names?
   end