[3.4] backport ignore old leader leases revoking requests #12202

Job	Run time
test (linux-amd64-fmt)	53s
test (linux-amd64-integration-1-cpu)	9m 36s
test (linux-amd64-integration-2-cpu)	10m 5s
test (linux-amd64-integration-4-cpu)	9m 34s
test (linux-amd64-functional)	8m 29s
test (linux-amd64-unit-4-cpu-race)	2m 56s
test (all-build)	3m 36s
test (linux-amd64-grpcproxy)	15m 14s
test (linux-amd64-e2e)	13m 13s
test (linux-386-unit)	2m 9s
	1h 15m 45s

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