currently, Across Odoo, there are bugfix folder in around 13 module, New manifest system allows to add new files in stable so the bugfix files are no longer required. after this commit, all the bugfix files are removed from all module.and all the code in those file is maintained as per New manifest system. Task : 2510653 closes odoo/odoo#69830 Related: odoo/enterprise#17936 Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>