Checked for duplicates

Yes - I've already checked

Alternatives considered

Yes - and alternatives don't suffice

Related problems

Needs basic CRUD functionality for Actions.

Describe the feature request

There is no way to delete or update the code of an action after it has been created. This will lead to a proliferation of older versions of the action, and user confusion because we cannot hide old versions in the actions list.

We need a way to:

• Delete unwanted action. We probably won't do this much in practice on ops but things get uploaded by mistake and we need an admin way to clean up.
• Update the code of an action. This could be a new revision of the same action, or if we had a way to make the old version "hidden" so that users couldn't run it, then we could just create a new action.