Add --dir flag to mkdir, fix root path resolution, and allow recursive root deletion
mkdir now supports --dir to create directories inside other directories,
with duplicate name detection. resolve() handles "/" as the root directory.
rm -yr / deletes all contents recursively. upload-test-data.sh rewritten to
create nested directory structures and handle filenames with spaces.
[CL-198] [CL-200] [CL-201] [CL-202]
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