Use `def before_setup` instead of `setup do`

`setup do` creates unnecessary allocations of proc objects in test
callbacks. This prevents that from happening and results in faster code.

Originally I had done this as `def setup` and all Railties tests passed.
See 044f9ab. Later it was reported there was an issue with this that
caused routes in tests to be nil because devs don't generally call
`super` in their test setups. Because of that I reverted the commit
until I could find a suitble replacement.

`before_setup` esentially does the same thing but without the
requirement that applications call `super` in their test setups.

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