[IMP] fields: write only once per Image field

Before this commit, flushing a model that uses the `image.mixin` would generate
twice as many queries as it should.

This is because `_compute_related` is not meant to be overridden. In the
override of `Image` we call `super()` then post process the records by
reassigning each record's relevant image field with `_image_process`.

The `super()` will assign the field of the records once which
will in turn trigger a `write` (and thus, will generate queries) then
after the `super()` call we reassign them which will re-trigger the same
`write` and the same queries.

With this commit, instead of overriding `_compute_related` we extract the
processing to a method that can be overridden, so that the `write` is called
simply once.

The result, obviously, is that queries related to the `write` are cut in half.

Related PR: #36683 & #36288

Co-authored-by: Adrian Torres <adt@odoo.com>
Co-authored-by: Sébastien Theys <seb@odoo.com>

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