@keystone-6/core: `isFilterable` bypass via `cursor` parameter in findMany (CVE-2025-46720 incomplete fix)

Summary field.isFilterable access control can be bypassed in findMany queries by passing a cursor. This can be used to confirm the existence of records by protected field values. The fix for CVE-2025-46720 field-level isFilterable bypass for update and delete mutations added checks to the where...