feat: add E2E tests for cases that peers going offline #1224

Job	Run time
e2e_tests (normal)	45m 45s
e2e_tests (concurent-back-source)	43m 4s
e2e_tests (grpc-tls)	42m 42s
e2e_tests (disable-seed-peer)	21m 42s
e2e_tests (grpc-tls-ipv6)	44m 51s
e2e_tests (ipv6)	38m 35s
e2e_tests (split-running-tasks)	41m 24s
e2e_tests (cache-list-metadata)	43m 51s
e2e_tests (write-buffer-size)	40m 27s
	6h 2m 21s

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