DrvOutputSubstitutionGoal: Don't actually fetch any store objects
#14648
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This progress on NixOS#11896. It introduces some issues temporarily which will be fixed when NixOS#11928 is fixed.
We now have a nice separation of concerns: `DrvOutputSubstitutionGoal` is *just* for getting realisations, and `PathSubstitutionGoal` is just for fetching store objects. The fetching of store objects that this used to do is now moved to the caller.
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Motivation
We now have a nice separation of concerns:
DrvOutputSubstitutionGoalis just for getting realisations, andPathSubstitutionGoalis just for fetching store objects.The fetching of store objects that this used to do is now moved to the caller.
Context
depends on #14247
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