feat: add E2E tests for cases that peers going offline #1225

Job	Run time
e2e_tests (normal)	42m 53s
e2e_tests (concurent-back-source)	40m 30s
e2e_tests (grpc-tls)	42m 24s
e2e_tests (disable-seed-peer)	1h 0m 44s
e2e_tests (grpc-tls-ipv6)	43m 19s
e2e_tests (ipv6)	39m 6s
e2e_tests (split-running-tasks)	40m 30s
e2e_tests (cache-list-metadata)	1h 0m 40s
e2e_tests (write-buffer-size)	41m 36s
	6h 51m 42s

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