feat: including return url in the cookie prefs feature tests

Author: marianayovcheva

features/step_definitions/cookie_preferences_steps.rb

@@ -4,5 +4,5 @@
   expect(page).to have_text("We'd also like to use additional cookies")
   expect(page).to have_no_text("It looks like you have JavaScript turned off.")
   expect(page).to have_link("find out more about the cookies we use", href: "/about-us/information/how-we-use-cookies/")
-  expect(page).to have_link("Choose cookies", href: "/cookie-preferences")
+  expect(page).to have_link("Choose cookies", href: "/cookie-preferences/?ReturnUrl=#{CGI.escape(current_url)}")
 end