UI Show Completion even when `completion.enable_completion_tracking` is disabled.

[feanil]

Steps to Reproduce:

1. Enabled the completion.enable_completion_tracking waffle switch in edx-platform.
2. As you browse a course in the learning MFE, stay on each component for 10secs - 1 minute (long enough to mark the unit as completed.
3. When you go to the next section, the nav should update to show the previous section has been completed.
   
4. Next disable the completion.enable_completion_tracking waffle switch.
5. Refresh the learning MFE, and you'll still see the green checkmarks.

This is a bug, if the completion tracking is disabled, you should not see elements in the UI that show completion related information.

[sarina]

This is approved to work on from a Product perspective ✅

[holaontiveros]

assign me