Include profile image version in URLs.

...apps/student/migrations/0048_add_profile_image_version.py

...geproficiency__add_unique_languageproficiency_code_use.py

common/djangoapps/student/models.py

common/djangoapps/student/tests/test_parental_controls.py

openedx/core/djangoapps/profile_images/tests/test_views.py

openedx/core/djangoapps/profile_images/views.py

openedx/core/djangoapps/user_api/accounts/image_helpers.py

.../djangoapps/user_api/accounts/tests/test_image_helpers.py

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