[IMP] web: remove m2o from supportedTypes in selection widget

currently widget selection is not working in m2o in editable list view and
to fix this issue it need a lots of changes to make it work properly,
i.e. make '_fetchSpecialRelation' use correct domain for each record,
batch requests as much as possible, also make all '_fetchSpecial...'
work in the list case.

So to avoid major changes remove supportedTypes from selection widget
so user can not tempted to apply selection widget on many2one field.

task-1871698

closes odoo/odoo#33485

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>