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>

config/environments/development.rb

@@ -99,4 +99,11 @@ Discourse::Application.configure do
   end
 
   config.hosts << /\A(([a-z0-9-]+)\.)*localhost(\:\d+)?\Z/
+
+  config.generators.after_generate do |files|
+    parsable_files = files.filter { |file| file.end_with?(".rb") }
+    unless parsable_files.empty?
+      system("bundle exec rubocop -A --fail-level=E #{parsable_files.shelljoin}", exception: true)
+    end
+  end
 end