🎨(frontend) add dsfr proconnect homepage

If we are with the DSFR theme, we need to add the
proconnect button to the homepage.
We add an option in the cunningham theme to
display the proconnect section instead of the
opensource section.

src/frontend/apps/e2e/__tests__/app-impress/common.ts

@@ -1,6 +1,17 @@
 import { Page, expect } from '@playwright/test';
 
-export const keyCloakSignIn = async (page: Page, browserName: string) => {
+export const keyCloakSignIn = async (
+  page: Page,
+  browserName: string,
+  fromHome: boolean = true,
+) => {
+  if (fromHome) {
+    await page
+      .getByRole('button', { name: 'Proconnect Login' })
+      .first()
+      .click();
+  }
+
   const login = `user-e2e-${browserName}`;
   const password = `password-e2e-${browserName}`;
 
@@ -258,3 +269,8 @@ export const mockedAccesses = async (page: Page, json?: object) => {
     }
   });
 };
+
+export const expectLoginPage = async (page: Page) =>
+  await expect(
+    page.getByRole('heading', { name: 'Collaborative writing' }),
+  ).toBeVisible();