insights: add "undo" to destructive actions

Created by: Joelkw

As the product grows more complex, we may want to let users undo deletes or similar destructive actions.

@unclejustin kicked off a great rfc for this: https://docs.google.com/document/d/1Mslo-azGwZSnPvKwnzgDEVrBJiQm0eK_OiXfEQgwB_0/edit#