Secure Context for Extract Jobs

The JobConfigurationExtract schema now includes an optional secureContext property. This field, which references the SecureContext schema, enables developers to provide key-value pairs of sensitive or context-specific information directly to extract jobs. These values can be retrieved using the SECURE_CONTEXT() function, allowing for dynamic modification of extract job behavior, especially for tables with row access policies. This expands the utility of secureContext beyond query jobs, offering more granular control over data extraction processes.