[sumac] chore: hide transcripts in video preview for library (#1459)

[navinkarkera]

Fixes: #1453
(cherry picked from commit e118eb5)

Backport of #1459

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Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                     Coverage Diff                      @@
##             open-release/sumac.master    #1474   +/-   ##
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  Coverage                             ?   93.17%           
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  Files                                ?     1054           
  Lines                                ?    20474           
  Branches                             ?     4368           
============================================================
  Hits                                 ?    19077           
  Misses                               ?     1334           
  Partials                             ?       63           

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