Fix app helper autoloading in dev and isolate namespace #8180
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This incorporates the changes from #3927 that when testing locally with the helper bug reproductions it resolves the autoloading issue. I think this has to be used with
isolate_namespace ActiveAdmin
in the engine file for this to be a safe change. With the namespace isolation in place, I encounter an error though when loading the login form page where the URL helpers don't seem to be accessible from the sessions new template. The admin pages work fine.