[SDK] Raise more human-readable name conflict exception (#2199) #965

Job	Run time
Publish Image (earlystopping-medianstop, cmd/earlystopping/medianstop/v1beta1/Dockerfile) / Publish Image	5m 19s
Publish Image (suggestion-darts, cmd/suggestion/nas/darts/v1beta1/Dockerfile) / Publish Image	2m 47s
Publish Image (suggestion-enas, cmd/suggestion/nas/enas/v1beta1/Dockerfile) / Publish Image	7m 55s
Publish Image (suggestion-goptuna, cmd/suggestion/goptuna/v1beta1/Dockerfile) / Publish Image	13m 39s
Publish Image (suggestion-hyperopt, cmd/suggestion/hyperopt/v1beta1/Dockerfile) / Publish Image	5m 10s
Publish Image (suggestion-hyperband, cmd/suggestion/hyperband/v1beta1/Dockerfile) / Publish Image	8m 0s
Publish Image (suggestion-optuna, cmd/suggestion/optuna/v1beta1/Dockerfile) / Publish Image	4m 13s
Publish Image (suggestion-pbt, cmd/suggestion/pbt/v1beta1/Dockerfile) / Publish Image	3m 59s
Publish Image (suggestion-skopt, cmd/suggestion/skopt/v1beta1/Dockerfile) / Publish Image	4m 8s
	55m 10s

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