refactor(create-react-router): use native Node.js instead of recursive-readdir

[MichaelDeBoey]

I'm sure people from the wider @e18e ecosystem cleanup (like @43081j, @benmccann & @outslept) will be very happy to see these kind of changes as well

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[43081j]

(sorry for the re-approval, was trying to close off my old review comments but it didn't work 😅 )

the filter change did work in the end it seems 👍

[timdorr]

Looks pretty similar to #13736 in scope. Thanks for getting this cleaned up!

[github-actions]

🤖 Hello there,

We just published version 7.6.3-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 7.6.3 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!