Fix JSZip dynamic import for esbuild

[canova]

Previously webpack was always using the CommonJS modules and had a transform for ES modules.

JSZip is a CommonJS module, but it looks like now esbuild returns an ES module namespace object for dynamic imports of CommonJS modules. Because of that, the JSZip import contents live inside .default.

I checked other dynamic imports too and it looks like this is the only one that is affected.

Before / After

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.56%. Comparing base (37b31b0) to head (19d90ba).
⚠️ Report is 26 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5858   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         319      319           
  Lines       31420    31420           
  Branches     8661     8575   -86     
=======================================
  Hits        26885    26885           
  Misses       4104     4104           
  Partials      431      431           

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