API: remove various associated fields included by default.

Remove various associated fields that were included by default on
certain endpoints. API users can use the only param to include the
full association if they need these fields.

* /artists.json: urls.
* /artist_urls.json: artist.
* /comments.json: creator_name and updater_name.
* /notes.json: creator_name.
* /pools.json: creator_name.
* /posts.json: uploader_name, children_ids, pixiv_ugoira_frame_data.
* /post_appeals.json: is_resolved.
* /post_versions.json: updater_name.
* /uploads.json: uploader_name.

app/models/upload.rb

@@ -70,8 +70,6 @@ class Upload < ApplicationRecord
 
   scope :preprocessed, -> { where(status: "preprocessed") }
 
-  api_attributes including: [:uploader_name]
-
   def initialize_attributes
     self.uploader_id = CurrentUser.id
     self.uploader_ip_addr = CurrentUser.ip_addr
@@ -175,12 +173,6 @@ class Upload < ApplicationRecord
     end
   end
 
-  module UploaderMethods
-    def uploader_name
-      uploader.name
-    end
-  end
-
   module VideoMethods
     def video
       @video ||= FFMPEG::Movie.new(file.path)
@@ -229,7 +221,6 @@ class Upload < ApplicationRecord
 
   include FileMethods
   include StatusMethods
-  include UploaderMethods
   include VideoMethods
   extend SearchMethods
   include SourceMethods