Made a few adjustments to test the beta redirect:

- Explicitly return the redirect
- Change the redirect to be a 302 instead of 301
- Adjusted the test client to allow sub domains
- Added the remaining tests

A big thank you to @A-Shumway42 for getting this work underway!

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

app/__init__.py

@@ -344,7 +344,7 @@ def redirect_notify_to_beta():
         and "beta.notify.gov" not in request.url
     ):
         url_to_beta = create_beta_url(request.url)
-        redirect(url_to_beta, 301)
+        return redirect(url_to_beta, 302)
 
 
 def load_service_before_request():