*: im_livechat, website_livechat
Access right should be based on channel type and membership instead.
Chat always private, group always private, channel private should
disapear and be a group instead (migration needed), and other channel
always public (but they can still be further restricted with
the "allowed groups" feature)
task-2632861
closesodoo/odoo#90415
Related: odoo/enterprise#30980
Related: odoo/upgrade#3850
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>