fix: allow folders in extra-resource (#1852)

[zhujin917]

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Summarize your changes:
Allow the extraResource field to accept folders. Fixes #1852.

As mentioned in #1852, since using graceful-fs's fs.promises.cp without options to copy extraResource, it can no longer copy folders. However, the document does not specify that the extraResource field cannot accept folders. Moreover, in versions v18.4.4 and earlier, it could also accept folders. Therefore, I believe this fix is appropriate.

[erikian]

@zhujin917 thanks for the PR! The Electron org requires signed commits for all contributions, could you please do that and update your branch?

[zhujin917]

Sorry for accidentally force pushing wrong commit :(
@erikian I have rebased from latest code and signed my commit. Please review it, thanks!

[erikian]

Thanks!

[welcome]

Thanks for your contribution! 🎉

[electron-npm-package-publisher]

🎉 This PR is included in version 19.0.5 🎉

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