Revert "factories/workbenches: Add a new `:with_referential` trait"

This reverts commit 073ac0eb3330787532f551d20abe4600a0615446.

I no longer need this factory. Originally added it for a test where I
thought I needed a collection of `Workbench`es. Turns out I instead
needed a collection of `Referential`s. Thus we don't have a need of
creating a workbench with a referential together.

0 files changed, 0 insertions, 0 deletions