fix: Pass the PipelineJob credentials to create_gcs_bucket_for_pipeline_artifacts_if_it_does_not_exist

[Ark-kun]

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Fixes #<issue_number_goes_here> 🦕

[sararob]

Thanks for this! Could you also add a unit test for cases when aiplatform.init is not called before calling PipelineJob.submit()?

[Ark-kun]

Thanks for this! Could you also add a unit test for cases when aiplatform.init is not called before calling PipelineJob.submit()?

What is the behavior that such test would needs to check?

Note that unit tests are executed without accessing any real infrastructure (GCS or PipelineService).