fix(course): resolve deletion failure for enrolled courses

[raizasafeel]

Summary

Course deletion was not working for those with student enrollment and progress. It has been fixed.

Related Issue

Closes #1929

[cypress]

lms    Run #1976

Run Properties:   Passed #1976  •  adc6985a9f ℹ️: Merge aeb2724e82e5d2cdcc550c2c9ed0ec13852c325e into b429fb2e47b682cc74cdacf3f9d9...

Project	lms
Branch Review	fix/course-deletion
Run status	Passed #1976
Run duration	01m 06s
Commit	adc6985a9f ℹ️: Merge aeb2724e82e5d2cdcc550c2c9ed0ec13852c325e into b429fb2e47b682cc74cdacf3f9d9...
Committer	Raizaaa
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	2
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[codecov-commenter]

Codecov Report

❌ Patch coverage is 94.14634% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.17%. Comparing base (5175050) to head (aeb2724).
⚠️ Report is 73 commits behind head on develop.

Files with missing lines	Patch %	Lines
lms/lms/test_helpers.py	89.56%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1998      +/-   ##
===========================================
+ Coverage    32.85%   33.17%   +0.32%     
===========================================
  Files          152      153       +1     
  Lines         5108     5116       +8     
===========================================
+ Hits          1678     1697      +19     
+ Misses        3430     3419      -11     

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