feat: implement FindCandidatePersistentCacheParents for scheduling pe… #1812

Job	Run time
e2e_tests (normal)	41m 24s
e2e_tests (concurent-back-source)	44m 9s
e2e_tests (disable-seed-peer)	21m 57s
e2e_tests (ipv6)	43m 49s
e2e_tests (split-running-tasks)	44m 14s
e2e_tests (cache-list-metadata)	38m 5s
e2e_tests (write-buffer-size)	45m 6s
	4h 38m 44s

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