[FIX] web: support kanban_view_ref attribute on many2one

Since commit [1], the Many2One field supports the attribute
"kanban_view_ref". When set, and when on a small screen, its value
is used as id of the kanban view to open when the user clicks in
the Many2One input (in the SelectCreateDialog). We lost the support
of this attribute in the owl conversion of the fields. This commit
thus re-introduce it.

Note that it is now deprecated and won't be supported in next
versions (>= saas-16.3), as it can simply be set in the context
instead. For instance:
```xml
  <field name="team_id" kanban_view_ref="%(sales_team.crm_team_view_kanban)s"/>
```
->
```xml
  <field name="team_id" context="{'kanban_view_ref': 'sales_team.crm_team_view_kanban'}"/>
```

[1] 80a8b662

opw 3152174

closes odoo/odoo#119024

Signed-off-by: Géry Debongnie <ged@odoo.com>