feat(AU-2283): Create transcript delete endpoint

[Rodra]

https://2u-internal.atlassian.net/browse/AU-2283

[codecov]

Codecov Report

Attention: Patch coverage is 96.72131% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.56%. Comparing base (11521db) to head (acd96d3).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
edxval/views.py	90.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #541      +/-   ##
==========================================
+ Coverage   94.52%   94.56%   +0.03%     
==========================================
  Files          31       31              
  Lines        3106     3165      +59     
  Branches      120      122       +2     
==========================================
+ Hits         2936     2993      +57     
- Misses        152      154       +2     
  Partials       18       18              

Flag	Coverage Δ
unittests	94.56% <96.72%> (+0.03%)	⬆️

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[BrandonHBodine]

What kind of permission does a user need to have to hit this endpoint?

[BrandonHBodine]

Requesting changes so we don't open this endpoint up to non staff or non course authors.