[FIX] *: do not use computed fields for resizing images

Otherwise recomputation may fail with "record does not exist or has been
deleted" when creating records with a value directly set for e.g.
'image_mediun' on a new product.

The issue comes from the storage of the images.  When creating a product, the
creation of an attachment for storing the field `image_medium` triggers the
recomputation of that field before its dependency `image` is set.  As `image`
is initially null, `image_medium` is recomputed as null, and this deletes the
attachment just created before the latter has completed its creation!  As a
consequence, some code at the end of `create` for the attachment crashes
because the record has been deleted.

The following models have been fixed: `fleet.vehicle.model.brand`,
`hr.employee`, `im_livechat.channel`, `mail.channel`, `payment.acquirer`,
`pos.category`, `product.template`, `product.public.category`, `res.partner`.

opw 666330
Closes #11516

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