refactor(mail): fail fast on an attachment part with no MIME handle

`cj/mu4e--save-attachment-part' called `cj/mu4e--ensure-attachment-save-functions' first, so a part with no MIME handle triggered the `mu4e-mime-parts' load before the handle check could fail. The handle check now runs first, so the malformed input is caught right away and the user-error fires the same way whether or not mu4e's MIME support is loadable. The test for that case drops the mu4e stubs it only needed because the load used to come first.

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