Move ensembler deletion logic to ensembler tojson method (#382) #257

Job	Run time
build-cluster-init	16s
build-test-experiment-engine-plugin	32s
build-router	58s
build-ui	1m 47s
release-rules	3s
test-engines-experiment	1m 10s
build-api	2m 6s
test-engines-router	2m 33s
test-api	3m 38s
test-e2e (In-cluster credentials; API e2e)	13m 21s
test-e2e (Remote cluster credentials; SDK e2e)	13m 52s
publish / publish-app	1m 16s
publish / publish-router	9s
	41m 41s

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