Wizard: Kernel step basics

This adds foundation for Kernel step, including gating and basic tests.

src/test/Components/CreateImageWizard/steps/FileSystemConfiguration/FileSystemConfiguration.test.tsx

@@ -116,6 +116,7 @@ const goToReviewStep = async () => {
   await clickNext(); // Timezone
   await clickNext(); // Locale
   await clickNext(); // Hostname
+  await clickNext(); // Kernel
   await clickNext(); // Details
   await enterBlueprintName();
   await clickNext(); // Review