Security: Unvalidated dynamic property access in createDataStorePredicate

# AWS Amplify Codegen UI - Unvalidated Dynamic Property Access in createDataStorePredicate

## Summary

The generated `createDataStorePredicate` function performs dynamic property access `p[field][operator]` where `field` and `operator` come from `DataStorePredicateObject` without validation against an allowlist. While the predicate object is typically developer-controlled via Studio config, the lack of validation means any field/operator string is accepted and used in bracket notation access.

## Affected Code

File: `packages/codegen-ui-react/lib/utils-file-functions/hooks/createDataStorePredicate.ts`

Start with packages/codegen-ui-react/lib/utils-file-functions/hooks/createDataStorePredicate.ts and trace how DataStorePredicateObject supplies field and operator. Determine the project’s expected allowlist and validation behavior, then add focused coverage; done means invalid dynamic property inputs are rejected or safely handled before bracket access.

Written by the indexing model from the issue text.