feat(registry): allow repository to use content.ExtendedCopy

[JefeDavis]

Fixes #806

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.92%. Comparing base (d9e1d43) to head (f01f0ed).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #807      +/-   ##
==========================================
+ Coverage   77.88%   77.92%   +0.04%     
==========================================
  Files          63       63              
  Lines        4694     4694              
==========================================
+ Hits         3656     3658       +2     
+ Misses        657      656       -1     
+ Partials      381      380       -1     

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[shizhMSFT]

This is a breaking change. See #806 (comment) for details.