ENH: Separate XNAT DAG into task groups

[josephmje]

Closes #25.

This PR:

• Refactors the functionality of datasources_to_xnat.py into the xnat_ingest.py TaskGroup and starts running pytest on this code ec7117a
• Moves the datman test config files to a more central folder and adds them to a pytest fixture for easy re-use 26760c6 and 8e37126
• Creates a single DAG in generate_study_dags.py where code from TaskGroups can be imported cf1c42c
• Adds a DAG integrity test as demonstrated here 9625921

[pep8speaks]

Hello @josephmje! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file airtigrs/dags/tests/test_dag_integrity.py:

Line 12:1: E302 expected 2 blank lines, found 1
Line 37:80: E501 line too long (80 > 79 characters)

Comment last updated at 2022-03-17 16:08:07 UTC