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fix: replace deprecated ec.Errorf with graphql.AddErrorf in code generator

The code generator templates were using ec.Errorf which has been
deprecated since 2020 in favor of graphql.AddErrorf. This caused
staticcheck SA1019 warnings in all generated code.

Changes:
- Updated codegen/directives.gotpl to use graphql.AddErrorf
- Updated codegen/type.gotpl to use graphql.AddErrorf
- Updated codegen/object.gotpl to use graphql.AddErrorf
- Regenerated all examples and test files

All existing tests pass with these changes.