VS: When not referencing output assembly do not try to copy it either

When generating a `ProjectReference` with `ReferenceOutputAssembly` set
to `false`, also set `CopyToOutputDirectory` to `Never`.  Otherwise
MSBuild might report a diagnostic like

    Project '<name>' is not up to date.
    CopyLocal reference '...\ZERO_CHECK' is missing from output location.

and rebuild the referencing project unnecessarily.
Status Job ID Name Coverage
  External
passed ghostflow-branch-check-master

passed ghostflow-commit-check

passed ghostflow-stager

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passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager