Test setattr operation for the mountpoint on linux and macos

[FirelightFlagboy]

Add test for setattr operations on Linux and macOS

Those test would typically lie in libparsec/crates/platform_mountpoint/tests/unit/operations/unix_setattr.rs

• [macos|rust] Add mountpoint test that perform a copy using finder.app #9366
• (linux, macos) test setattr used for truncate to an arbitrary size (same size as current one, bigger size, smaller size, zero size)
• (linux, macos) test setattr used to change the others fields allowed by it but not supported (atime, etc.)
• (linux, macos) test setattr with a non-handled attr #9365
• (linux, macos) test setattr to change size on a folder

The osascript in question is:

#!/usr/bin/osascript

on run argv
    try
        -- Get file and dest path from arguments
        set file_path to item 1 of argv
        set dest_path to item 2 of argv

        -- Use Finder to copy the file to dest
        tell application "Finder"
            set source_file to POSIX file file_path as alias
            set destination_folder to POSIX file dest_path as alias
            duplicate source_file to destination_folder
        end tell

    on error err_msg number err_num
        -- Print error message to stderr
        do shell script "echo " & quoted form of ("Error: " & err_msg) & " >&2"
        return err_num
    end try
end run

The script is not perfect:

• On failure, the return seems to always be 0
• On failure, no message seems to be displayed

Originally posted by @touilleMan in #9351 (review)