rails: update framework files and settings to 7.0.

* Update framework files with `bin/rails app:update`.
* Update to use new Rails 7.0 default settings, except for a couple
  things regarding new cookie and cache formats that would prevent us
  from rolling back to Rails 6.1 if necessary.

config/application.rb

@@ -7,15 +7,16 @@
 require_relative 'boot'
 
 require "rails"
+require "active_model/railtie"
+require "active_job/railtie"
 require "active_record/railtie"
 # require "active_storage/engine"
 require "action_controller/railtie"
-require "action_view/railtie"
 require "action_mailer/railtie"
-require "active_job/railtie"
-# require "action_cable/engine"
 # require "action_mailbox/engine"
 # require "action_text/engine"
+require "action_view/railtie"
+# require "action_cable/engine"
 require "rails/test_unit/railtie"
 
 # Load the gems for the current Rails environment from the Gemfile.