[FIX] rating: value range of star notation

When rating with the smiley mecanism, the rating value will be 1,
3 or 7. The rating model allow value in range [0, 10]. When using
the star mecanism, usually, only 5 stars are used to introduced a
rating. This will set a rating value in the range [0, 5], which
is not aligned with the range of the model, nor the smiley range.

Purpose of this commit is to uniformize the range of rating, so if a
model is using both mecanism, the average will be correct. Solving
this problem implies to apply a conversion factor between the
database value and the displayed one.

Migration:
As only product.template was using star mecanism in odoo community,
a migration step should be applied to multiply of ratings of
product.template by 2.

Task-1941432

closes odoo/odoo#31141

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