E2E pipeline simplification #8438

Job	Run time
build / Build	6m 57s
Integration Tests (certrotation)	1m 24s
Integration Tests (etcdrestore)	1m 37s
Integration Tests (localstorage)	1m 19s
Integration Tests (startup)	6m 48s
Integration Tests (custometcdargs)	45s
Integration Tests (etcdsnapshot)	7m 17s
Integration Tests (kubeflags)	6m 38s
Integration Tests (longhorn)	2m 31s
Integration Tests (secretsencryption)	2m 58s
Integration Tests (flannelnone)	1m 27s
	39m 41s

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