feat: add E2E tests for cases that peers going offline #1218

Job	Run time
e2e_tests (normal)	43m 0s
e2e_tests (concurent-back-source)	43m 13s
e2e_tests (grpc-tls)	40m 42s
e2e_tests (disable-seed-peer)	21m 56s
e2e_tests (grpc-tls-ipv6)	41m 18s
e2e_tests (ipv6)	45m 38s
e2e_tests (split-running-tasks)	37m 41s
e2e_tests (cache-list-metadata)	43m 7s
e2e_tests (write-buffer-size)	45m 0s
	6h 1m 35s

Provide feedback