chore: change webhook payload structure #2208

Job	Run time
build-api	2m 5s
build-router	53s
build-test-experiment-engine-plugin	32s
build-cluster-init	15s
build-ui	1m 44s
release-rules	2s
test-engines-experiment	18s
test-engines-router	2m 5s
test-api	3m 13s
test-e2e (In-cluster credentials; API e2e)	13m 48s
test-e2e (Remote cluster credentials; SDK e2e)	13m 21s
publish / publish-app	1s
publish / publish-router	1s
	38m 18s

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