Move back cookie fetch to SignInForm. Role fetched and saved into a Context. Small refactorings.

src/components/AuthUser/ChoseRole/ChoseRole.test.tsx

+import React from 'react';
+import { render } from '@testing-library/react';
+import { ChoseRole } from './ChoseRole';
+
+describe('<ChoseRole />', () => {
+  it('renders without crashing', () => {
+    const wrapper = render(<ChoseRole />);
+    expect(wrapper.queryByTestId('ChoseRole')).toBeTruthy();
+  });
+});