[IMP] tests: use addCleanup and addClassCleanup where useful
[IMP] tests: use addCleanup and addClassCleanup where useful

This commit takes advantages of the features added in the parent commit
to have better/cleaner tests.

closes odoo/odoo#39368

Signed-off-by: Adrian Torres (adt) <510911ca0904df843254643ba27120ccabfde1b1@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo