name the trait in ambiguous-associated-items fully qualified suggestion

We have the trait at this point, so we can name it in the error
message, rather than using "Trait" as a (potentially confusing)
placeholder.

Thanks to Yuki "@JohnTitor" Okushi for pointing out where to look (in
the same file) for a closely related issue for ambiguous associated
types (as opposed to items; that was #59225, except that one won't be
quite as easy to resolve, because we actually don't have the trait
`DefId` at that point).

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