Add unit test for `create_experiment` in the `katib_client` module #1376

Job	Run time
Publish Image (katib-controller, cmd/katib-controller/v1beta1/Dockerfile) / Publish Image	13m 57s
Publish Image (katib-db-manager, cmd/db-manager/v1beta1/Dockerfile) / Publish Image	4m 23s
Publish Image (file-metrics-collector, cmd/metricscollector/v1beta1/file-metricscollector/Dockerf... / Publish Image	5m 39s
Publish Image (katib-ui, cmd/ui/v1beta1/Dockerfile) / Publish Image	31s
Publish Image (tfevent-metrics-collector, cmd/metricscollector/v1beta1/tfevent-metricscollector/D... / Publish Image	6m 25s
	30m 55s

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