It's important that we don't perform pg_dumps against databases
running behind pgbouncer.
We had an old monkey-patch to prevent this, but following some [recent
internal rails refactoring](5488686851),
the patch no longer works. Instead, we can use the official
`config.active_record.dump_schema_after_migration` option.
Setting this to false in production is recommended by Rails, and is the
default for newly generated Rails applications.
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
