[chore] Use named return values for getNodes

[cedric-cordenier]

This is required by chainreader when there are multiple return values.

As per Bolek's feedback on my PR here: #13427, I'm splitting this out to get it in sooner.

[github-actions]

I see you updated files related to core. Please run pnpm changeset in the root directory to add a changeset as well as in the text include at least one of the following tags:

• #added For any new functionality added.
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[github-actions]

I see you updated files related to contracts. Please run pnpm changeset in the contracts directory to add a changeset.