Enable frozen string in app/graphql + app/finders

What does this MR do?

Enable frozen string literals in app/finders/**/*.rb and app/graphql/**/*.rb.

Why was this MR needed?

Because frozen strings require fewer memory allocations, and memory efficiency is a good thing.

What are the relevant issue numbers?

Partially addresses #47424 (closed).

Suggested Reviewers/Approvers/Mergers

@stanhu @godfat @rymai

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