Remove development: Make workspace factory strategy agnostic

The following discussion from !105783 (merged) should be addressed:

• @splattael started a discussion:

  Question (non-blocking) How does the factory work when build or build_stubbed is used? 🤔

  Perhaps we could tweak this factory and pass the timestamps to associations directly instead of update!ing them? 🤔

  See #262624

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NOTES

This may be difficult because of the validations/manipulations the models do on the timestamps.

This current implementation was tricky to get right, and is working for all the current cases.