cubicweb-forge #1381187 Add checkings before accepting to publish a version [open]

Either: - list all tickets that are still 'opened' and not yet 'done' (e.g. in a table under the text frame used for comments in the transition view) or - check that all tickets are in state 'done' before accepting to publish the version. If it's not the case, it could be nice to have an option to pass in state 'done' all tickets that are still opened but whose 'load left' is null.

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