test: v3 fork create and set assessment group for all product types

[rackstar]

Description

added on v3 fork phase 3:

• create new assessor group with 3 assessors
• set new assessor group as assessor for ALL product types

NOTE: this PR is behind #1478

Testing

• tested on fork machine
• added assertions locally (not committed) to verify assessors indeed belongs to newly created assessor group
• added assertions locally (not committed) to verify newly created assessor group is set for ALL procduct types

Checklist

• Performed a self-review of my own code
• Made corresponding changes to the documentation