Refactor ensembler image naming convention (#368) #1932

Job	Run time
build-test-experiment-engine-plugin	33s
build-router	1m 3s
build-api	2m 11s
build-cluster-init	22s
build-ui	7m 38s
release-rules	7s
test-engines-experiment	1m 29s
test-engines-router	3m 9s
test-api	5m 40s
test-e2e (In-cluster credentials; API e2e)	12m 53s
test-e2e (Remote cluster credentials; SDK e2e)	13m 48s
publish / publish-app	1s
publish / publish-router	1s
	48m 55s

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