Change completion API to work with any learning context

common/djangoapps/student/helpers.py

common/djangoapps/student/tests/test_views.py

...goapps/course_api/blocks/transformers/block_completion.py

...se_api/blocks/transformers/tests/test_block_completion.py

lms/djangoapps/courseware/module_render.py

lms/djangoapps/gating/signals.py

lms/djangoapps/lms_xblock/runtime.py

...ngoapps/content_libraries/tests/test_content_libraries.py

...x/core/djangoapps/content_libraries/tests/test_runtime.py

...edx/core/djangoapps/user_api/accounts/tests/test_utils.py

openedx/core/djangoapps/xblock/rest_api/views.py

openedx/core/djangoapps/xblock/runtime/mixin.py

openedx/core/djangoapps/xblock/runtime/runtime.py

openedx/core/lib/gating/api.py

openedx/core/lib/gating/tests/test_api.py

...ures/course_experience/tests/views/test_course_outline.py

openedx/features/course_experience/utils.py

openedx/tests/completion_integration/test_handlers.py

openedx/tests/completion_integration/test_models.py

openedx/tests/completion_integration/test_services.py