fix(image-builder):Refactor ensembler image naming convention #1929

Job	Run time
build-api	1m 55s
build-cluster-init	18s
build-router	1m 6s
build-test-experiment-engine-plugin	37s
build-ui	1m 51s
release-rules	2s
test-engines-experiment	1m 0s
test-engines-router	2m 45s
test-api	4m 48s
test-e2e (In-cluster credentials; API e2e)	13m 33s
test-e2e (Remote cluster credentials; SDK e2e)	13m 59s
publish	0s
	41m 54s

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