Module Completion Page: Prevent manual module completion

[jfdoming]

Summary

We want to prevent users from inadvertently/intentionally manually completing a module by navigating to the completion page.

Goals

• Prevent users from manually navigating to ?completed=true without having actually completed the module.

Implementation

When the completion page loads, re-fetch the user's module completion details, and redirect them to their latest incomplete lesson if they haven't completed the entire module.