Make sure localhost requests are allowed regardless of order specs are run in (#259)

spec/features/user_spec.rb

@@ -1,4 +1,5 @@
 require "rails_helper"
+require_relative "../request_helper"
 
 RSpec.describe "User Features" do
   let!(:user) { FactoryBot.create(:user, last_sign_in_at: Time.zone.now) }

spec/request_helper.rb

@@ -1,8 +1,9 @@
 require "webmock/rspec"
 
+WebMock.disable_net_connect!(allow_localhost: true)
+
 module RequestHelper
   def self.stub_http_requests
-    WebMock.disable_net_connect!(allow_localhost: true)
     WebMock.stub_request(:get, /api.postcodes.io/)
       .to_return(status: 200, body: "{\"status\":404,\"error\":\"Postcode not found\"}", headers: {})
     WebMock.stub_request(:post, /api.notifications.service.gov.uk\/v2\/notifications\/email/)