activerecord: Remove redundant steep:ignore FallbackAny comments (#1040)

steep 2.0.0 reports these as `Ruby::RedundantIgnoreComment` errors.

Author: kozy4324

gems/activerecord/7.2/_test/activerecord-generated.rb

@@ -36,7 +36,7 @@ class Article < ActiveRecord::Base
 
 User.eager_load(:address, friends: [:address, :followers])
 User.includes(:address, :friends).to_a
-User.preload(:address, friends: [:address, { followers: :users }]) # steep:ignore FallbackAny
+User.preload(:address, friends: [:address, { followers: :users }])
 User.in_order_of(:id, [1, 5, 3])
 User.offset(5).limit(10)
 User.count

gems/activerecord/8.0/_test/activerecord-generated.rb

@@ -36,7 +36,7 @@ class Article < ActiveRecord::Base
 
 User.eager_load(:address, friends: [:address, :followers])
 User.includes(:address, :friends).to_a
-User.preload(:address, friends: [:address, { followers: :users }]) # steep:ignore FallbackAny
+User.preload(:address, friends: [:address, { followers: :users }])
 User.in_order_of(:id, [1, 5, 3])
 User.offset(5).limit(10)
 User.count