chore: add new label to reserved key list #2150

Job	Run time
build-api	1m 55s
build-router	57s
build-cluster-init	15s
build-test-experiment-engine-plugin	31s
build-ui	1m 50s
test-engines-experiment	28s
release-rules	4s
test-engines-router	1m 4s
test-api	1m 46s
test-e2e (In-cluster credentials; API e2e)	13m 17s
test-e2e (Remote cluster credentials; SDK e2e)	13m 17s
publish / publish-router	1s
publish / publish-app	1s
	35m 26s

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