[openstreetmap/openstreetmap-website] Add a preferred_email_format preference (#1511)

[Andy Allan]

I'm also unsure if we're mixing up some concepts. A text-only email, with an image attachment, is still a multipart message. The choice that we're offering should be in terms of "html vs text", not "multipart vs text".

I know that we don't send any text + attachment emails at the moment, but we might in the future. I've spent a long time refactoring existing parts of this codebase that have unnecessary complications in terminology!

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