fix(arborist): inherit overrides from fsParent

[TrevorBurnham]

Note to reviewers: The CI failures are unrelated to the code changes in this CR. They're caused by git dirty complaining because there was a release of @npmcli/git that hasn't been merged in yet: npm/git#224

---

Currently, a package's overrides have no effect on dependencies declared in its workspaces (#4205).

I did some digging and found that:

1. In the virtual tree, workspace nodes are fsChildren of the root, not
   children.
2. Nodes inherit overrides from their parent, but not from their fsParent.

As a result, workspace nodes in the virtual tree weren't inheriting the root's overrides.

The fix here is to allow nodes to inherit fsParent.overrides. I've added tests for load-virtual and reify to demonstrate that overrides are correctly applied to a workspace dependency with this change.

References

Fixes #4205

[wraithgar]

CI failures are hopefully fixed in #8115

This PR has been added to npm/statusboard#920, and @owlstronaut will make sure it's not colliding w/ existing work there.

[owlstronaut]

Hey @TrevorBurnham! Thanks for opening this. Just a heads-up that we’re trying to land #8089, which reworks how overrides propagate from parents to children—shifting the logic to the edges rather than at the node level. Because that PR removes the exact code you’re modifying here, your changes may no longer be applicable once it lands. As such, I'll close this. Still appreciate your contribution, and feel free to weigh in if you have any questions or concerns!

[TrevorBurnham]

@owlstronaut Nice, I've confirmed that the test cases in e8bd8bc pass against #8089. 👍 Feel free to cherry-pick them if you agree that they demonstrate the correct behavior; I think it'd be helpful to have direct test coverage for workspace overrides.

[owlstronaut]

@owlstronaut Nice, I've confirmed that the test cases in e8bd8bc pass against #8089. 👍 Feel free to cherry-pick them if you agree that they demonstrate the correct behavior; I think it'd be helpful to have direct test coverage for workspace overrides.

Wonderful, thank you! I've got that on my radar