Fix multiple file handling in CustomScript noexec workaround

[Copilot]

The node_script_path variable was being reassigned inside the file processing loop, causing subsequent files to be moved from the wrong location when multiple scripts needed relocation due to noexec mounts.

Changes:

• Introduced cwd_path variable to track destination directory separately from source path
• node_script_path now remains constant throughout the loop as the source location
• Only cwd_path is updated when files are moved to executable directories

Before:

for file in self._files:
    # ... copy file to node_script_path ...
    node_script_path = self._move_files_into_executable_dir(
        node_script_path, file  # BUG: reassigns source path
    )
self._cwd = node_script_path

After:

cwd_path = node_script_path
for file in self._files:
    # ... copy file to node_script_path ...
    cwd_path = self._move_files_into_executable_dir(
        node_script_path, file  # source path stays constant
    )
self._cwd = cwd_path

This ensures all files are moved from their original copied location rather than attempting to move from an already-relocated path.

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