DEV: Drop unused google and instagram auth_info tables

Information was migrated to user_associated_accounts in fc7938f7e0 and 703c724cf3

db/post_migrate/20191129144706_drop_unused_google_instagram_auth_tables.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'migration/table_dropper'
+
+class DropUnusedGoogleInstagramAuthTables < ActiveRecord::Migration[6.0]
+  DROPPED_TABLES ||= %i{
+        google_user_infos
+        instagram_user_infos
+      }
+
+  def up
+    DROPPED_TABLES.each do |table|
+      Migration::TableDropper.execute_drop(table)
+    end
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end