Draft: Add sign_in_path JSON endpoint to session controller

Drew Blessingrequested to merge
dblessing_sign_in_backend into master

What does this MR do and why?

Add sign_in_path JSON endpoint to session controller

This new path will allow the sign-in Vue app to determine the appropriate sign in path for a given login value (username or email address). For FOSS, always nil, which means stay here. For SaaS the sign-in may redirect to another cell or in the future to an organization-specific sign-in page.

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How to set up and validate locally

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