Upgrade to Rails 7.1

We're disabling `action_controller.raise_on_missing_callback_actions`
because sometimes we include `before_action :something, only: actions`
in concerns, and we include these concerns in controllers that don't
have all these actions.

Note that Rails 7.1 logs to STDOUT by default [1]; we're re-adding the
condition `if ENV["RAILS_LOG_TO_STDOUT"].present?` because we're still
using files and we're rotating the logs to avoid running out of space.

Also note that the GraphQL controller test (which is actually a request
test, since it's got `type: :request`) that was raising an exception no
longer does it thanks to the new default value for the
`config.action_dispatch.show_exceptions` configuration option. So we're
updating the test accordingly. This option doesn't affect regular
controller tests (without the `type: :request` option), so in other
tests we're still checking exceptions.

[1] Pull request 47138 in https://github.com/rails/rails

.rubocop.yml

@@ -186,6 +186,8 @@ Layout/MultilineMethodCallBraceLayout:
 
 Layout/MultilineMethodCallIndentation:
   Enabled: true
+  Exclude:
+    - "config/environments/production.rb"
 
 Layout/MultilineOperationIndentation:
   Enabled: true
@@ -698,6 +700,8 @@ Style/AndOr:
 
 Style/ArgumentsForwarding:
   Enabled: true
+  Exclude:
+    - "bin/setup"
 
 Style/ArrayCoercion:
   Enabled: true