fix(fxci): Normalize 'resource.name' in fxci_derived.worker_costs_v1

[ahal]

It seems that the resource.name field from the billing export can sometimes take the form:

projects/<id>/instances/<name>

And other times it's simply:

<name>

Update the worker costs query to account for this.

Issue: #5759

Checklist for reviewer:

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• If adding a new field to a query, ensure that the schema and dependent downstream schemas have been updated.
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