FIX: action_code_path not being loaded for user-stream-item (#18577)

This commit fixes an issue where we had a typo in the
UserAction.stream query which meant that action_code_path
was not loaded correctly. Once that was fixed, we were also
not actually using the action_code_path in the user-stream-item,
so that has been fixed here too.

The bug this caused was that, when the link for the action was
clicked within the user-stream-item, the user would be redirected
to a URL ending with `[missing%20%%7Bpath%7D%20value]` because
the I18n call did not have the path present.

spec/models/user_action_spec.rb

@@ -122,6 +122,7 @@ RSpec.describe UserAction do
         log_test_action(action_type: UserAction::ASSIGNED)
         private_post.custom_fields ||= {}
         private_post.custom_fields["action_code_who"] = 'testing'
+        private_post.custom_fields["action_code_path"] = '/p/1234'
         private_post.custom_fields["random_field"] = 'random_value'
         private_post.save!
       end
@@ -133,6 +134,7 @@ RSpec.describe UserAction do
 
         expect(user_action_row.action_type).to eq(UserAction::ASSIGNED)
         expect(user_action_row.action_code_who).to eq('testing')
+        expect(user_action_row.action_code_path).to eq('/p/1234')
       end
     end