Refactor local Makefile to run relevant things before tests/devserver
The tests now depend on webpack being built, so do that before running make test.
The devserver depends on migrations being run, so do that as well.
I'm not entirely sure the migration part is the right thing to do, but at least with the webpack part, running the tests will do reasonable things.
Test Plan
make test still works
Migrated from D320 (view on Phabricator)