Remove redundant category in generated release notes #80

Job	Run time
Unit tests	2m 45s
Unit tests	2m 45s
Build tests	2m 34s
Build tests	2m 34s
E2E tests (k8s-oldest, read-only)	5m 20s
E2E tests (k8s-oldest, read-only)	5m 6s
E2E tests (k8s-oldest, read-write)	8m 5s
E2E tests (k8s-oldest, read-write)	8m 5s
E2E tests (k8s-plus-one, read-only)	5m 53s
E2E tests (k8s-plus-one, read-only)	5m 53s
E2E tests (k8s-plus-one, read-write)	7m 38s
E2E tests (k8s-plus-one, read-write)	7m 38s
	1h 4m 16s

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