Add Debugging Log Statements for user_id LtiError
This release adds supplemental logging to diagnose the bug reported in MST-1540: https://2u-internal.atlassian.net/browse/MST-1540. The bug is that learners are encountering the LtiError when trying to do an LTI launch. The learners appear to be authenticated, so this error should not occur. The bug is not easily reproducible in production or development, so this supplemental logging is added to help understand the user's state when the error is raised. This logging will be removed once MST-1540 is resolved.