task-2767820 This move is done to prepare the use of server side model definitions during tests. Indeed, a model having all type of tracked fields will be needed to ease tracking value testing. This model will be added to the test_mail module so the tracking value tests need to be there as well. closes odoo/odoo#85819 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>