On a form view (of model A), define a many2one (model B) with a [form|tree]_view_ref context key
In that view, have a x2m field (model C) with a different [form|tree]_view_ref context key
Before this commit, the second load_views (i.e. on the model C) crashed because
the wrong context key was sent to the server, which returned the view to which the _view_ref points
i.e. the view of the model B
After this commit, we clean the context of subviews loading, because those keys are only useful for the python
and one shot. Hence, there is no crash
OPW 1903780
closesodoo/odoo#28260