[bamaer]

Fixes #8779. With "Create parent folder" enabled, Change file encoding created the parent folder of the source file instead of the target file, so writing to a new folder failed. Source and target are now read and written through HopVfs, so VFS locations work too.

transforms/main-0120-change-file-encoding writes into a folder that does not exist yet: it fails before this change and passes after it.

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