Draft: Decouple user's personal namespace in specs
What does this MR do and why?
Remove the user's personal namespace shim for:
spec/services/projects/fork_service_spec.rb
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #435446