feat: add pluggable override for course home progress username obfuscation

[pwnage101]

ENT-11572

---

Related:

• feat: add pluggable override for course home progress username obfuscation #2555
• feat: replace enterprise username import in progress/views.py with pluggable_override openedx-platform#38108

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.02%. Comparing base (585472a) to head (ddcf716).
⚠️ Report is 57 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2555   +/-   ##
=======================================
  Coverage   86.01%   86.02%           
=======================================
  Files         249      250    +1     
  Lines       16673    16683   +10     
  Branches     1655     1656    +1     
=======================================
+ Hits        14342    14352   +10     
  Misses       1997     1997           
  Partials      334      334           

Flag	Coverage Δ
unittests	86.02% <100.00%> (+<0.01%)	⬆️

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[pwnage101]

LGTM! just one minor nit.