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Add goccy/go-yaml to _examples/tools.go to fix circular dependency

The code generator (run via go run ../../testdata/gqlgen.go) depends
on goccy/go-yaml transitively through codegen/config. Adding it to
tools.go ensures go mod tidy preserves this dependency, following
the same pattern used for dataloaden and golang.org/x/text.

Also updated:
- _examples/enum/gqlgen.yaml: Quote TRUE/FALSE keys (goccy YAML spec compliance)
- codegen/config/config_test.go: Update error message expectations (goccy uses \n on all platforms)

Fixes circular dependency where go mod tidy would remove goccy from
_examples/go.sum, causing subsequent code generation to fail.