Adapt specs to not use anonymous user

Api::BaseController#authenticate is already taking care of the unauthenticated use case when spree_current_user is nil

spec/features/consumer/producers_spec.rb

@@ -22,10 +22,6 @@ feature '
   let(:shop) { create(:distributor_enterprise) }
   let!(:er) { create(:enterprise_relationship, parent: shop, child: producer1) }
 
-  before :each do
-    use_api_as_unauthenticated_user
-  end
-
   before do
     product1.set_property 'Organic', 'NASAA 12345'
     product2.set_property 'Biodynamic', 'ABC123'

spec/features/consumer/shops_spec.rb

@@ -14,10 +14,6 @@ feature 'Shops', js: true do
   let!(:producer) { create(:supplier_enterprise) }
   let!(:er) { create(:enterprise_relationship, parent: distributor, child: producer) }
 
-  before :each do
-    use_api_as_unauthenticated_user
-  end
-
   before do
     producer.set_producer_property 'Organic', 'NASAA 12345'
   end

spec/support/request/authentication_workflow.rb

@@ -68,12 +68,6 @@ module AuthenticationWorkflow
     fill_in "password", with: user.password
     click_button "Login"
   end
-
-  def use_api_as_unauthenticated_user
-    allow_any_instance_of(Api::BaseController).to receive(:spree_current_user) {
-      Spree::User.anonymous!
-    }
-  end
 end
 
 RSpec.configure do |config|