Update jenkins test task
Update jenkins test task

> Instead of setting TEST_TASK here, it would be better to set
something like DEFAULT_TEST_TASK, and use that as a fallback below.
That way it's still possible to override the task to run for running
the schema tests etc. See
https://github.com/alphagov/travel-advice-publisher/blob/content_ids/jen
kins.sh for an example.

mikeee/z_archived-calculators,mikeee/z_archived-calculators,mikeee/z_archived-calculators,mikeee/z_archived-calculators