DEV: Add spec to ensure app works with multiple tagged loggers

When upgrading to Rails 7.1, we had some problems because we were using
several tagged loggers at the same time. They were all added to the main
broadcast logger shipped with Rails, but the Rails 7.1 codebase contains
a bug making a request being run as many times as there are tagged loggers.

The fix was to use the code from the Rails 7.2 codebase.

This patch adds a small spec to ensure the behavior will stay the proper
one in the future.

spec/integrity/having_multiple_tagged_loggers_spec.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+RSpec.describe "Having multiple tagged loggers", type: :request do
+  let(:loggers) { 2.times.map { ActiveSupport::TaggedLogging.new(Logger.new(nil)) } }
+
+  before { loggers.each { Rails.logger.broadcast_to(_1) } }
+
+  after { loggers.each { Rails.logger.stop_broadcasting_to(_1) } }
+
+  it "does not execute request twice" do
+    expect_any_instance_of(SilenceLogger).to receive(:call_app).once.and_call_original
+    get "/user_actions.json"
+  end
+end