feat: add E2E tests for cases that peers going offline #1101

Job	Run time
e2e_tests (normal)	38m 27s
e2e_tests (concurent-back-source)	38m 10s
e2e_tests (grpc-tls)	38m 46s
e2e_tests (disable-seed-peer)	22m 21s
e2e_tests (grpc-tls-ipv6)	39m 39s
e2e_tests (ipv6)	40m 52s
e2e_tests (split-running-tasks)	39m 9s
e2e_tests (cache-list-metadata)	37m 53s
e2e_tests (write-buffer-size)	37m 35s
	5h 32m 52s

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