Chains kind E2E Tests

Add user-facing doc "SLSA Provenance" #1411

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Run time

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Job	Run time
k8s (v1.25.x) / e2e test	9m 19s
k8s (v1.26.x) / e2e test	11m 34s
k8s (v1.27.x) / e2e test	12m 43s
pipelines-lts (v0.41.3) / e2e test	9m 10s
pipelines-lts (v0.47.3) / e2e test	12m 6s
pipelines-lts (v0.44.4) / e2e test	11m 18s
pipelines-lts (v0.50.1) / e2e test	12m 22s
pipelines-lts (v0.51.0) / e2e test	13m 41s
	1h 32m 13s