fix: Automatically set authentication type to SERVICE_ACCOUNT when a service account is provided

[fangyh20]

[gemini-code-assist]

Summary of Changes

Hello @fangyh20, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the authentication configuration for Dataproc Spark Connect sessions by introducing a more intuitive and robust mechanism. It ensures that when a service account is specified, the system intelligently defaults to SERVICE_ACCOUNT authentication, thereby simplifying setup and preventing potential misconfigurations related to authentication types.

Highlights

• Authentication Type Precedence: The system now automatically sets the authentication type to SERVICE_ACCOUNT if a service account is explicitly provided, overriding any DATAPROC_SPARK_CONNECT_AUTH_TYPE environment variable setting.
• Service Account Configuration: The logic for configuring the service account from the DATAPROC_SPARK_CONNECT_SERVICE_ACCOUNT environment variable has been reordered to ensure it's processed before determining the authentication type.
• New Unit Test: A new unit test, test_service_account_sets_auth_type_automatically, has been added to verify that providing a service account correctly triggers the automatic SERVICE_ACCOUNT authentication type.

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[gemini-code-assist]

Code Review

This pull request correctly implements logic to automatically set the authentication type to SERVICE_ACCOUNT when a service account is provided. This is a good enhancement that simplifies configuration for users and prevents potential misconfigurations. The new unit test effectively validates this new behavior. I've included a couple of minor suggestions to improve code readability by factoring out long, repeated attribute access chains into local variables.