Is it possible to restore the default actions setup that was there when Drafts 5 is installed the first time?
The default action groups are available in the groups section of the Action Directory. Look through the groups posted by “agiletortoise”.
Right. But the other part of the question should probably be how to remove all the existing actions.
Depends on if it is restore the groups or restore the library of groups. I took it to be the former as the OP may have other actions that are to be retained.
But taking a look at the manage option under the groups listing reveals edit mode where groups can be deleted, which I’m sure you knew 
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Yay! I hadn’t found that. Just what I was looking for.