While only notes can be deleted on threads, some tracking messages are
created with the type "notification", some messages are created as
notes. This commit prevents deletion and editing of messages that have
tracking values, as they are invaluable for traceability and not
user-created.
closesodoo/odoo#76593
X-original-commit: b51de3464e3c30ef23f0ee4e8d6128f9ca6ce8b1
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>