Wizard: Kernel step basics

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

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

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+import type { Router as RemixRouter } from '@remix-run/router';
+import { screen, waitFor } from '@testing-library/react';
+import { userEvent } from '@testing-library/user-event';
+
+import {
+  clickBack,
+  clickNext,
+  verifyCancelButton,
+} from '../../wizardTestUtils';
+import { clickRegisterLater, renderCreateMode } from '../../wizardTestUtils';
+
+let router: RemixRouter | undefined = undefined;
+
+const goToKernelStep = async () => {
+  const user = userEvent.setup();
+  const guestImageCheckBox = await screen.findByRole('checkbox', {
+    name: /virtualization guest image checkbox/i,
+  });
+  await waitFor(() => user.click(guestImageCheckBox));
+  await clickNext(); // Registration
+  await clickRegisterLater();
+  await clickNext(); // OpenSCAP
+  await clickNext(); // File system configuration
+  await clickNext(); // Snapshots
+  await clickNext(); // Custom repositories
+  await clickNext(); // Additional packages
+  await clickNext(); // Users
+  await clickNext(); // Timezone
+  await clickNext(); // Locale
+  await clickNext(); // Hostname
+  await clickNext(); // Kernel
+};
+
+describe('Step Kernel', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    router = undefined;
+  });
+
+  test('clicking Next loads First boot script', async () => {
+    await renderCreateMode();
+    await goToKernelStep();
+    await clickNext();
+    await screen.findByRole('heading', {
+      name: 'First boot configuration',
+    });
+  });
+
+  test('clicking Back loads Hostname', async () => {
+    await renderCreateMode();
+    await goToKernelStep();
+    await clickBack();
+    await screen.findByRole('heading', { name: 'Hostname' });
+  });
+
+  test('clicking Cancel loads landing page', async () => {
+    await renderCreateMode();
+    await goToKernelStep();
+    await verifyCancelButton(router);
+  });
+});
+
+// TO DO 'Kernel step' -> 'revisit step button on Review works'
+// TO DO 'Kernel request generated correctly'
+// TO DO 'Kernel edit mode'