[R] Copy_files not copying specific file

### Describe the bug, including details regarding any error messages, version, and platform.

Copy_files() function in R, is returning no error but is not coping specific file from S3 to local
(ex. copy_files(bucket$path('latam/fy2024_q3/01_data_preparation/recipe_bin.rds'),"/workspace/HYJUMP/b2b-falcon-global-mdls/recipe_bin.rds") does not work.

Instead, copy)files() copies all files from S3 directory into local directory
(ex. copy_files(bucket$path('latam/fy2024_q3/01_data_preparation/'),"/workspace/HYJUMP/b2b-falcon-global-mdls/" - This works)

How is should copy specific file using R Arrow between file systems

### Component(s)

R

Start by reproducing the R Arrow copy_files() examples with an S3 file and local destination, comparing the specific-file and directory cases described in the issue. Check the copy_files() entry point and related R tests or documentation; done means the specific S3 object is copied to the requested local path or the limitation is clearly documented.

Scritto dal modello di indicizzazione a partire dal testo della issue.