feat: add E2E tests for cases that peers going offline #1216

Job	Run time
e2e_tests (normal)	40m 42s
e2e_tests (concurent-back-source)	44m 4s
e2e_tests (grpc-tls)	46m 49s
e2e_tests (disable-seed-peer)	21m 35s
e2e_tests (grpc-tls-ipv6)	42m 5s
e2e_tests (ipv6)	45m 6s
e2e_tests (split-running-tasks)	41m 58s
e2e_tests (cache-list-metadata)	51m 41s
e2e_tests (write-buffer-size)	39m 12s
	6h 13m 12s

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