Refactor Devise integration

- Use scoped users
- Use the named route helpers instead of hardcoded paths

spec/features/registrar/home_link_spec.rb

@@ -2,7 +2,7 @@ require 'rails_helper'
 
 RSpec.feature 'Registrar area home link', db: true do
   scenario 'is visible' do
-    visit registrar_login_url
+    visit new_registrar_user_session_url
     expect(page).to have_link('registrar-home-btn', href: registrar_root_path)
   end
 end

spec/features/registrar/sign_in/mobile_id_spec.rb

@@ -9,7 +9,7 @@ RSpec.feature 'Mobile ID login', db: true do
   end
 
   scenario 'login with phone number' do
-    visit registrar_login_path
+    visit new_registrar_user_session_url
     click_on 'login-with-mobile-id-btn'
 
     fill_in 'user[phone]', with: '1234'

spec/features/registrar/sign_in/password_spec.rb

@@ -1,39 +0,0 @@
-require 'rails_helper'
-
-RSpec.feature 'Registrar area password sign-in' do
-  scenario 'signs in the user with valid credentials' do
-    create(:api_user_with_unlimited_balance,
-           active: true,
-           login: 'test',
-           password: 'testtest')
-
-    visit registrar_login_path
-    sign_in_with 'test', 'testtest'
-
-    expect(page).to have_text(t('registrar.base.current_user.sign_out'))
-  end
-
-  scenario 'notifies the user with invalid credentials' do
-    create(:api_user, login: 'test', password: 'testtest')
-
-    visit registrar_login_path
-    sign_in_with 'test', 'invalid'
-
-    expect(page).to have_text('No such user')
-  end
-
-  scenario 'notifies the user with inactive account' do
-    create(:api_user, active: false, login: 'test', password: 'testtest')
-
-    visit registrar_login_path
-    sign_in_with 'test', 'testtest'
-
-    expect(page).to have_text('User is not active')
-  end
-
-  def sign_in_with(username, password)
-    fill_in 'depp_user_tag', with: username
-    fill_in 'depp_user_password', with: password
-    click_button 'Login'
-  end
-end

spec/features/registrar/sign_out_spec.rb

@@ -1,14 +0,0 @@
-require 'rails_helper'
-
-RSpec.feature 'Registrar area sign-out', settings: false do
-  background do
-    sign_in_to_registrar_area(user: create(:api_user_with_unlimited_balance))
-  end
-
-  scenario 'signs the user out' do
-    visit registrar_root_path
-    click_on t('registrar.base.current_user.sign_out')
-
-    expect(page).to have_text('Signed out successfully.')
-  end
-end