Add use client directives to the created mjs wrappers

[Andarist]

fixes bvaughn/react-error-boundary#182

I'm not 100% sure if this should be done at all though. It doesn't solve the case when the directive is in non-entrypoint file.

[changeset-bot]

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Latest commit: 985e57f

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[Andarist]

now the use client directive is in this file and the one that it reexports (the CJS file) - I think it should be harmless, right?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.39%. Comparing base (9f44a11) to head (985e57f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #590   +/-   ##
=======================================
  Coverage   92.38%   92.39%           
=======================================
  Files          39       39           
  Lines        2049     2051    +2     
  Branches      625      639   +14     
=======================================
+ Hits         1893     1895    +2     
  Misses        146      146           
  Partials       10       10           

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