Add 'copy.mode = FALSE' to all calls of file.copy outside tools directory

[savyajha]

Fix for https://github.com/rstudio/bslib/issues/1154.

I am facing the same problem and I saw that the issue was reported earlier.

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[gadenbuie]

Thanks for the PR @savyajha. It'd be helpful if you could join the conversation in #1154 to provide additional details.

[gadenbuie]

Superseded by #1184