Fix TitleBuilder prefix not applied when production check is unavailable

Extract production_dependencies? helper that rescues when the
ecosystem's production check is not registered (e.g. in API-path
mode or isolated test contexts), defaulting to production=true.

Register npm_and_yarn production check in the TitleBuilder spec to
ensure correct dev/prod prefix selection in tests.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: kbukum1

common/spec/dependabot/pull_request_creator/message_builder/components/title_builder_spec.rb

@@ -7,6 +7,18 @@
 
 namespace = Dependabot::PullRequestCreator::MessageBuilder
 RSpec.describe namespace::Components::TitleBuilder do
+  before do
+    Dependabot::Dependency.register_production_check(
+      "npm_and_yarn",
+      lambda do |groups|
+        return true if groups.empty?
+        return true if groups.include?("optionalDependencies")
+
+        groups.include?("dependencies")
+      end
+    )
+  end
+
   describe "#build" do
     context "with no prefix" do
       subject(:builder) do