conftest: Set HTTP_IN_PROGRESS to True when creating partial deposits.
conftest is cheating by hard-resetting the deposit status to partial after creating a complete deposit; but it doesn't make sense for a real scenario.
Additionally, a future commit will add a test relying on the 'partial_deposit' not scheduling a task, so the HTTP_IN_PROGRESS header will need to be True at that point.
Depends on !173 (closed)
Migrated from D4589 (view on Phabricator)