Chore: replace usage of `LogId.leader_id` with `LogId.leader_id()` #4338

Job	Run time
test-crate-openraft (stable)	52s
openraft-test-bench (nightly)	1m 1s
test-crate-openraft (nightly)	50s
test-crate-tests (stable, 0)	3m 16s
test-crate-tests (nightly, 30)	3m 17s
Build (nightly, bench,serde,bt,singlethreaded)	50s
cluster-benchmark (cluster_benchmark)	50s
test-crate-tests (nightly, 0, single-term-leader)	3m 0s
examples (stable, memstore)	44s
openraft-feature-test (nightly)	49s
lint	3m 51s
examples (stable, rocksstore)	5m 36s
openraft-feature-test (nightly, serde)	56s
examples (stable, raft-kv-memstore)	2m 42s
openraft-feature-test (nightly, serde,singlethreaded)	53s
rt-monoio	42s
examples (stable, raft-kv-memstore-grpc)	1m 13s
examples (stable, raft-kv-memstore-network-v2)	1m 0s
examples (stable, raft-kv-memstore-opendal-snapshot-data)	1m 18s
stores (stores/memstore)	53s
examples (stable, raft-kv-memstore-singlethreaded)	1m 1s
tests-feature-test (nightly)	3m 10s
tests-feature-test (nightly, single-term-leader)	2m 59s
examples (stable, raft-kv-rocksdb)	7m 40s
examples (nightly, memstore)	58s
examples (nightly, rocksstore)	10m 31s
examples (nightly, raft-kv-memstore)	2m 19s
examples (nightly, raft-kv-memstore-grpc)	1m 6s
examples (nightly, raft-kv-memstore-network-v2)	1m 11s
examples (nightly, raft-kv-memstore-opendal-snapshot-data)	1m 28s
examples (nightly, raft-kv-memstore-singlethreaded)	1m 12s
examples (nightly, raft-kv-rocksdb)	11m 32s
	1h 19m 40s

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