feat: add E2E tests for cases that peers going offline #1231

Job	Run time
e2e_tests (normal)	42m 0s
e2e_tests (concurent-back-source)	41m 16s
e2e_tests (grpc-tls)	43m 57s
e2e_tests (disable-seed-peer)	21m 26s
e2e_tests (grpc-tls-ipv6)	42m 54s
e2e_tests (ipv6)	45m 5s
e2e_tests (split-running-tasks)	43m 4s
e2e_tests (cache-list-metadata)	41m 45s
e2e_tests (write-buffer-size)	42m 9s
	6h 3m 36s

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