Move per-row Contact lookup to the database.

On admin report lists, and in front-end lists when an inspector, each
row was querying the database for `category_display`. We create a new
relationship for this query, and join/prefetch it wherever we request
this data.

Include staff joins on /around page, copying what happens on /reports
to prevent more lookups there too. Also add some joins for user email
in admin report list.

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