[FEATURE] migrate attributevalues using serialized_attributes_values field

[pixelmatseriks]

Is your feature request related to a problem? Please describe.
Seems like there can be duplicate attribute values on products.
We need to clear out the invalid ones, maybe by just keeping the attribute value with the newest tstamp.

Describe the solution you'd like
Investigate if it would work to just drop all attribute values and rebuild them using product field serialized_attributes_values.
If not the migration wizard should be able to detect and remove invalid attribute values