DEV: Upgrade Rails to version 7.1 (#27539)

* DEV: Upgrade Rails to 7.1

* FIX: Remove references to `Rails.logger.chained`

`Rails.logger.chained` was provided by Logster before Rails 7.1
introduced their broadcast logger. Now all the loggers are added to
`Rails.logger.broadcasts`.

Some code in our initializers was still using `chained` instead of
`broadcasts`.

* DEV: Make parameters optional to all FakeLogger methods

* FIX: Set `override_level` on Logster loggers (#27519)

A followup to f595d599dd361b7fb39fb3c82cbc11d19d518c19

* FIX: Don’t duplicate Rack response

---------

Co-authored-by: Jarek Radosz <jradosz@gmail.com>

spec/lib/site_setting_extension_spec.rb

@@ -422,9 +422,7 @@ RSpec.describe SiteSettingExtension do
       end
     end
 
-    let :test_enum_class do
-      TestEnumClass
-    end
+    let(:test_enum_class) { TestEnumClass }
 
     before do
       settings.setting(:test_enum, "en", enum: test_enum_class)