✅(e2e) change accounts to facilitate SIRET and add e2e test

We also add registration ID info to the /me endpoint, via serializers

src/frontend/apps/e2e/__tests__/app-desk/siret.spec.ts

@@ -0,0 +1,23 @@
+import { expect, test } from '@playwright/test';
+
+import { keyCloakSignIn } from './common';
+
+test.beforeEach(async ({ page, browserName }) => {
+  await page.goto('/');
+  await keyCloakSignIn(page, browserName, 'marie');
+});
+
+test.describe('OIDC interop with SIRET', () => {
+  test('it checks the SIRET is displayed in /me endpoint', async ({ page }) => {
+    const header = page.locator('header').first();
+    await expect(header.getByAltText('Marianne Logo')).toBeVisible();
+
+    const response = await page.request.get(
+      'http://localhost:8071/api/v1.0/users/me/',
+    );
+    expect(response.ok()).toBeTruthy();
+    expect(await response.json()).toMatchObject({
+      organization: { registration_id_list: ['21580304000017'] },
+    });
+  });
+});