Disable Hanami monkeypatch on Hanami 2.2

In the previous commit we started reading the action name from the
Hanami Action instance on the request env.

Disable the monkeypatch on Hanami 2.2+ so it's not doing the same thing
twice. We'll leave the monkeypatch for now, but eventually we should be
able to remove it. Like on the next major Hanami version or after some
years.

Part of #911

lib/appsignal/loaders/hanami.rb

@@ -23,9 +23,12 @@ def on_start
         )
         hanami_app_config.middleware.use(Appsignal::Rack::HanamiMiddleware)
 
+        return unless Gem::Version.new(Hanami::VERSION) < Gem::Version.new("2.2.0")
+
         ::Hanami::Action.prepend Appsignal::Loaders::HanamiLoader::HanamiIntegration
       end
 
+      # Legacy instrumentation to set the action name in Hanami apps older than Hanami 2.2
       module HanamiIntegration
         def call(env)
           super

spec/lib/appsignal/loaders/hanami_spec.rb

@@ -37,9 +37,16 @@ def uninstall_hanami_middleware
           )
       end
 
-      it "prepends the integration to Hanami::Action" do
-        expect(::Hanami::Action)
-          .to have_received(:prepend).with(Appsignal::Loaders::HanamiLoader::HanamiIntegration)
+      if DependencyHelper.hanami2_2_present?
+        it "does not prepend a monkeypatch integration to Hanami::Action" do
+          expect(::Hanami::Action).to_not have_received(:prepend)
+            .with(Appsignal::Loaders::HanamiLoader::HanamiIntegration)
+        end
+      else
+        it "prepends the integration to Hanami::Action" do
+          expect(::Hanami::Action).to have_received(:prepend)
+            .with(Appsignal::Loaders::HanamiLoader::HanamiIntegration)
+        end
       end
 
       def hanami_middleware_options
@@ -80,10 +87,19 @@ def make_request(env)
         context "with an active transaction" do
           let(:env) { { Appsignal::Rack::APPSIGNAL_TRANSACTION => transaction } }
 
-          it "sets action name on the transaction" do
-            make_request(env)
+          if DependencyHelper.hanami2_2_present?
+            it "does not set an action name on the transaction" do
+              # This is done by the middleware instead
+              make_request(env)
+
+              expect(transaction).to_not have_action
+            end
+          else
+            it "sets action name on the transaction" do
+              make_request(env)
 
-            expect(transaction).to have_action("HanamiApp::Actions::Books::Index")
+              expect(transaction).to have_action("HanamiApp::Actions::Books::Index")
+            end
           end
         end
       end