refactor: pyupgrade second iteration (#27447)

cms/djangoapps/cms_user_tasks/tests.py

...oapps/contentstore/management/commands/clean_cert_name.py

...ngoapps/contentstore/management/commands/create_course.py

.../contentstore/management/commands/empty_asset_trashcan.py

...ps/contentstore/management/commands/export_all_courses.py

...apps/contentstore/management/commands/generate_courses.py

...ontentstore/management/commands/import_content_library.py

...angoapps/contentstore/management/commands/sync_courses.py

cms/djangoapps/contentstore/views/course.py

cms/djangoapps/contentstore/views/entrance_exam.py

cms/djangoapps/export_course_metadata/tasks.py

cms/djangoapps/export_course_metadata/test_signals.py