Revert "Merge pull request #12778 from etehtsea/rake-default-fix"

This reverts commit ec0a2b57f67c9153cb5f7bbe2a3f66d13fe64bdd, reversing
changes made to a8bd7b16260c217290ef8fe3a166fcceac442c62.

This reverts commit 555ec36522011862c03b483c53be32410594a51e

This reverts commit 555ec36522011862c03b483c53be32410594a51e

By default, Rails uses the `default` Rake task to run all tests.
This commit changed the environment of the default task to `development`.
This clears the development database and has other negative consequences.