[FIX] web: BasicModel: nested x2many and unknown fields

Consider the following situation:
 - have a form view with an x2many field displayed as a list
 - the x2many field has a form view that contains an x2many field,
   which isn't in the list
 - for that x2many field, we can also open a form view to see/edit
   the related records.

As the x2many field isn't in the list, when we open a subrecord, we
modify the fieldsInfo to add the information about the x2many field
we didn't know before. Doing so automatically applies raw changes
that we might have stored earlier (from onchanges) for that field,
 because we couldn't apply them before knowing the type of that
field.

Before this commit, the function that applies the raw changes was
called recursively on the dataPoint and all its children (thus on
the x2many list datapoint), which produced a crash as this function
is designed to work on dataPoints of type record.

Actually, calling it on sub datapoints is useless, as it properly
works recursively, and applies raw changes on x2many fields itself
when necessary.

This commit ensures that we don't call this function on list
datapoints anymore.

Closes #62334
OPW 2389991

closes odoo/odoo#62399

Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>

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