Change "Published" state to "Confirmed" in the Session Acceptance workflow

Fixing tag. We'll just use one tag.

Oooh, I thought this was everywhere, but if it is just on the session workflow, that makes sense.
I imagine this includes the training as well, and other related activities.

Moving the work to allow session authors to confirm on their own to a child issue.

Reduced the scope by pushing the bigger tasks to child issues, and pushed the simpler changes.