Sam Saffron 412e1ebbe2 DEV: correct parallel specs rake tasks
This used to work due to side effects.

`rake parallel:migrate` used to work very inconsistently and would only migrate
some of the databases.

This introduces the recommended change to db.yml so the correct database is
found based off TEST_ENV_NUMBER if for some reason we did not set it using
RAILS_DB

Also avoids a bunch of schema dumping which is not needed when migrating
parallel specs



DB number 1 is very odd cause for whatever reason parallel spec is not
setting it.
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