feat: Drop canShowUpgradeSock course data.

[feanil]

DEPR: openedx/openedx-platform#36429

This piece of data is not being used anywhere but was still being
consumed so just drop the data so that the backend can be updated to no
longer provide the data.

The backend API is being updated in openedx/openedx-platform#36436

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.09%. Comparing base (e5f04d9) to head (9260892).
Report is 18 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1647   +/-   ##
=======================================
  Coverage   90.08%   90.09%           
=======================================
  Files         338      338           
  Lines        5782     5783    +1     
  Branches     1407     1407           
=======================================
+ Hits         5209     5210    +1     
  Misses        556      556           
  Partials       17       17           

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[bradenmacdonald]

Thanks!