Load all records in Relation#inspect

A test was failing due to the way that Relation#inspect causes
association proxies to ignore unsaved records added to the association.

This is fixed by simply calling to_a and letting to_a figure out how to
get the records (which, in the case of associations, takes into account
new records).

I think it is acceptable to do this rather than limiting the query at
the database level:

* It's what we've done in all released Rails versions up to this point
* The goal of the limit is to not flood the console with output - this
  is the problem we're targeting, rather than the actual loading of the
  records from the database
* You probably want to do something with those records later anyway,
  otherwise you wouldn't have built a relation for them.

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