feat: add E2E tests for cases that peers going offline #1187

Job	Run time
e2e_tests (normal)	41m 55s
e2e_tests (concurent-back-source)	37m 52s
e2e_tests (grpc-tls)	44m 11s
e2e_tests (disable-seed-peer)	21m 46s
e2e_tests (grpc-tls-ipv6)	41m 34s
e2e_tests (ipv6)	36m 53s
e2e_tests (split-running-tasks)	42m 27s
e2e_tests (cache-list-metadata)	40m 23s
e2e_tests (write-buffer-size)	37m 29s
	5h 44m 30s

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