Summary of Changes

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This pull request enhances the Dataflow runner's option handling by automatically including the use_gbek service option when the gbek pipeline option is specified. This change aims to streamline policy enforcement for users, ensuring that use_gbek is only enabled through the designated gbek option, thereby preventing misconfigurations and promoting secure practices across both Java and Python SDKs.

Highlights

• Automatic use_gbek option handling: When the --gbek pipeline option is provided, the use_gbek service option is automatically added to the Dataflow service options in both Java and Python runners. This ensures consistency and allows for policy enforcement.
• Enforced use_gbek usage: Direct setting of use_gbek in dataflow_service_options is now disallowed. Users must use the --gbek pipeline option, which then implicitly adds use_gbek. An IllegalArgumentException (Java) or ValueError (Python) is thrown if use_gbek is set directly without --gbek.

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