Tests refactoring to use util call_api.

tests/dummy.py

tests/mutations/snapshots/snap_test_create_report.py

tests/mutations/test_create_report.py

tests/mutations/test_login.py

tests/mutations/test_login_by_shortcut.py

tests/schema/test_authors.py

tests/schema/test_login_shortcuts.py

tests/schema/test_node.py

tests/schema/test_report_drafts.py

tests/schema/test_search_reports.py

tests/schema/test_viewer.py