WorkbenchImportWorker: Reinstate creation of `./tmp/imports`

If the directory doesn't exist, we should create it to ensure we don't
get errors trying to write to a location that doesn't exist. I had
removed this because I assumed the dir would be created during
deployment, but I guess I shouldn't assume. Also, we want to ensure the
dir gets created on dev machines without errors.

This line is updated from last time where we'd create
`Rails.root.join('tmp', 'imports')`. Now we use our `#temp_directory`,
which can be variable.

Refs #4315

0 files changed, 0 insertions, 0 deletions