Fix: revert FsPoly.copyDir() changes

[emmercm]

RE: https://github.com/emmercm/igir/pull/1087

[github-actions[bot]]

:test_tube: Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/revert-copy-dir" [commands..] [options]

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.21%. Comparing base (9e14aad) to head (e15c010).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1098 +/- ## ======================================= Coverage 93.20% 93.21% ======================================= Files 92 92 Lines 6066 6074 +8 Branches 1445 1447 +2 ======================================= + Hits 5654 5662 +8 Misses 391 391 Partials 21 21 ```

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[github-actions[bot]]

:lock: Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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