Add the option to generate a legacy cookie

[marcosteixeira]

https://web.dev/samesite-cookie-recipes/#handling-incompatible-clients

Workaround for some incompatible browsers like some versions of Safari to handle the SameSite option.

Enabled by

# config/initializers/rails_same_site_cookies.rb

RailsSameSiteCookie.configure do |config|
  config.generate_legacy_cookie = true
end