Before this commit, the state selection field was positioned
on the left of the sheet, just above the title. Now, it is
positioned on the right of sheet.
This commit also fixes the text displayed by this field by
using the value of the fields (normal;blocked;done)_legend.
Finally, this commit removes the last uses of the deprecated
field `kanban_state_selection`.
closesodoo/odoo#97765
Signed-off-by: Bruno Boi (boi) <boi@odoo.com>