Improvements to test/api/test_workflow_extraction.py.
Fill out the dataset collection parameter test and add a new test for a workflow that includes subcollection mapping. Move toward orchestrating jobs in this file via a high-level YAML description of steps and test data as well as some higher-level methods for testing various stuff about extracted workflows (step counts, input types, tools used, connected-ness, etc...).

Allow ordering jobs index API by create_time instead of update_time.