Keep the manifests as light as possible, to easily see custom behavior/content. Complete the work of previous commits cleaning the manifests content: *42bad1a6d2*ef7005f524and make sure this kind of cleanup commit is not necessary in the future because it is now automatically verified by a dedicated test. closes odoo/odoo#107735 Related: odoo/enterprise#34903 Signed-off-by: Julien Castiaux <juc@odoo.com>