Merge branch 'labkit-middleware-first' into 'master'

Move labkit middleware to the top of the stack

See merge request gitlab-org/gitlab!45901

config/initializers/labkit_middleware.rb

 # frozen_string_literal: true
 
-Rails.application.config.middleware.use(Labkit::Middleware::Rack)
+# partial backport of https://github.com/rails/rails/pull/38169
+# this is in order to be able to re-order rack middlewares.
+
+if ActionDispatch::MiddlewareStack.method_defined?(:move)
+  warn "`move` is now defined in in ActionDispatch itself: https://github.com/rails/rails/pull/38169, please remove this patch from #{__FILE__}"
+else
+  module ActionDispatch
+    class MiddlewareStack
+      def move(target, source)
+        source_index = assert_index(source, :before)
+        source_middleware = middlewares.delete_at(source_index)
+
+        target_index = assert_index(target, :before)
+        middlewares.insert(target_index, source_middleware)
+      end
+    end
+  end
+end
+
+unless Rails::Configuration::MiddlewareStackProxy.method_defined?(:move)
+  module Rails
+    module Configuration
+      class MiddlewareStackProxy
+        def move(*args, &block)
+          @operations << ->(middleware) { middleware.send(__method__, *args, &block) }
+        end
+        ruby2_keywords(:move) if respond_to?(:ruby2_keywords, true)
+      end
+    end
+  end
+end
+
+Rails.application.config.middleware.move(1, ActionDispatch::RequestId)
+Rails.application.config.middleware.insert_after(ActionDispatch::RequestId, Labkit::Middleware::Rack)