Implement CI checks for avoiding duplicate directory bot errors
The bot symlinks everything from the `software-layer-scripts` repo here https://github.com/EESSI/software-layer/blob/main/bot/build.sh#L8, which can result in failures seen in https://github.com/EESSI/software-layer/pull/1412#issuecomment-3944962779 The solution to avoid this should be two pretty simple CI checks: - one on the `software-layer` side that clones software-layer-scripts  and runs the symlink commands - one on the `software-layer-scripts` side that clones software-layer and run the symlink commands
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