Don't use Black on snapshots and migrations

pyproject.toml

tests/mutations/snapshots/snap_test_create_report.py

tests/mutations/snapshots/snap_test_login.py

tests/mutations/snapshots/snap_test_login_by_shortcut.py

tests/mutations/snapshots/snap_test_update_report.py

tests/schema/snapshots/snap_test_authors.py

tests/schema/snapshots/snap_test_login_shortcuts.py

tests/schema/snapshots/snap_test_node.py

tests/schema/snapshots/snap_test_report_drafts.py

tests/schema/snapshots/snap_test_search_reports.py

tests/schema/snapshots/snap_test_viewer.py

tests/snapshots/snap_test_management.py

tests/snapshots/snap_test_middleware.py

tests/snapshots/snap_test_models.py