[FIX] web: prevent wrong date format if picker used too soon on frontend

If datetimepickers were used too soon after page loading, they would use
the wrong format and UI options as the code in charge of initializing
those options was not fully lazy loaded yet.

With this patch, we prevent the tempusdominus lib to consider pickers
that are in a body that is marked by the lazyloader during the lazy
loading of JS files. We could potentially not add the lib attribute
(data-toggle="datetimepicker") on those elements and let the business
code initializing the pickers add it but that would not have been a
stable fix and it may be better this way as this works generically.

opw-2944720

closes odoo/odoo#98529

Signed-off-by: Romain Derie (rde) <rde@odoo.com>