[SDK] test: add unit test for list_jobs method of the training_client #1673

Job	Run time
Publish Image (storage-initializer, sdk/python/kubeflow/storage_initializer/Dockerfile, sdk/pytho... / Publish Image	11m 36s
Publish Image (kubectl-delivery, build/images/kubectl-delivery/Dockerfile, linux/amd64,linux/arm6... / Publish Image	57s
Publish Image (trainer-huggingface, sdk/python/kubeflow/trainer/Dockerfile, sdk/python/kubeflow/t... / Publish Image	11m 9s
Publish Image (training-operator, build/images/training-operator/Dockerfile, linux/amd64,linux/ar... / Publish Image	24m 10s
Publish Image (training-operator, cmd/training-operator.v2alpha1/Dockerfile, linux/amd64,linux/ar... / Publish Image	17m 26s
	1h 5m 18s

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