Ensure workspace gets appropriate workspace class if created from a prebuild

[Furisto]

Is your feature request related to a problem? Please describe

A workspace should get a workspace class that is

Describe the behaviour you'd like

• If the configured workspace class and the prebuild workspace class is the same use the configured workspace class
• If the configured workspace class is bigger than the prebuild workspace class use the configured workspace class
• if the configured workspace class is smaller than the prebuild workspace class use the prebuild workspace class