[REF] mail: factorize activity 'mark as done' action

The purpose of this commit is to factorize the common behavior of
marking an activity as done, which means delete it and create its
forced next activities.
We need a few entry points (for wizard button, for rpc calls from
webclient), so instead of rewritting every implementation, we make
them use the same new private method. Otherwise, adding a new way
to mark an acitivity as done (by uploading a file, for instance),
we gonna need to write quite similar method that the existing ones.

Unfortunately, in the private implementation of `_action_done`,
checking if some activities need to have their force next ones
created cost one more query.
As this refectoring make the activity lifecycle robust, we can
accept this (the old version might be consider as false as we can
mark an activity as done without creating its forced next
activities).

Task-1915004

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