Add ability to turn off verbose for database tasks

You could use the `VERBOSE` env var to turn off output for migrations
tasks but you couldn't use it for other tasks.

This change moves the `verbose?` check to a method so we can also use it
in create and drop respectively.

tenderlove and I noticed this as part of the ongoing work in parallel
testing. When the parallel tests boot the app needs to create new
databases for each worker. The output from these is unnecessary but
there was previously no way to turn it off. Now if `VERBOSE=false` is
passes to `bin/rails db:create` the text "Created blah blah db" will no
longer be output.

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