feat(OEXCOM-80): disable completion item icons on flag

[holaontiveros]

fixes #1692

Description

Currently when the ENABLE_COMPLETION_TRACKING_SWITCH waffle switch is disabled the frontend doesn't take it into account and still displays completion for anything that was already completed.

This PRs uses the same API fo the sidebar toggles that already exists where in this PR for edx-platform was added the current status of the switch and based on that it changes how the "completion status" it's shown, which it would be the default for nothing being touched at that point on the course

Screenshots

flag disabled

flag enabled

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.43%. Comparing base (67bb54a) to head (4206dbf). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1714      +/-   ##
==========================================
+ Coverage   90.42%   90.43%   +0.01%     
==========================================
  Files         344      344              
  Lines        5785     5793       +8     
  Branches     1348     1394      +46     
==========================================
+ Hits         5231     5239       +8     
+ Misses        537      535       -2     
- Partials       17       19       +2     

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[holaontiveros]

@holaontiveros, the code looks good, thanks!

Can you please include step-by-step testing instructions in the PR, though? Assume the reviewer has a standard Tutor dev environment with the demo course loaded and this PR checked out and running, but nothing more.

@arbrandes Done, thank you