Previously we would delete all invites and confirmation tokens upon
completing the action that they represent.
This change instead adds a flag on each token indicating whether it has
been completed so we can action a
completed token differently in the UI to reduce confusion for users.
This had been brought up a number of times where confirmation emails,
team member invites and other items
may have been actioned and forgotten about causing an error toast/page
upon subsequent revisit.
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