feat(api): Add user-configurable secrets for deployments and ensembling jobs #2246

Job	Run time
build-api	2m 4s
build-router	1m 4s
build-cluster-init	16s
build-test-experiment-engine-plugin	31s
build-ui	1m 53s
test-engines-experiment	20s
release-rules	5s
test-engines-router	1m 15s
test-api	1m 46s
test-e2e (In-cluster credentials; API e2e)	13m 45s
test-e2e (Remote cluster credentials; SDK e2e)	13m 48s
publish	0s
	36m 47s

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