[IMP] stock: default responsible + activity responsible

Traceback when the responsible is not set on an activity
since it's a required field. In this case we will use the
odoo system responsible for the activity.

Also reintroduce the default value for the responsible as
the user that create the product. The purpose is to avoid
to log all the activity for the odoo system but to dispatch
the exception between user, if a user create the product he
will probably be responsible for it. It is always possible
to remove the responsible or to modify it.

Task ID - 1913168

closes odoo/odoo#29138

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