feat(api): Add user-configurable secrets for deployments and ensembli… #2253

Job	Run time
build-api	2m 7s
build-cluster-init	15s
build-router	58s
build-test-experiment-engine-plugin	34s
build-ui	3m 14s
test-engines-experiment	50s
release-rules	5s
test-engines-router	2m 35s
test-api	7m 42s
test-e2e (In-cluster credentials; API e2e)	12m 44s
test-e2e (Remote cluster credentials; SDK e2e)	16m 23s
publish / publish-router	7s
publish / publish-app	19s
	47m 53s

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