chore: rename test fixtures internal field: routing_table to nodes #2767

Job	Run time
cluster-benchmark (cluster_benchmark)	46s
lint	6m 27s
external-stores (stores/rocksstore-v2)	5m 56s
examples (stable, raft-kv-memstore)	2m 15s
openraft-feature-test (nightly)	49s
openraft-test (stable, 0)	3m 2s
openraft-feature-test (nightly, serde)	49s
openraft-test-bench (nightly)	57s
examples (stable, raft-kv-rocksdb)	7m 36s
openraft-test (nightly, 30)	3m 8s
openraft-feature-test (nightly, single-term-leader)	53s
examples (nightly, raft-kv-memstore)	2m 19s
openraft-test (nightly, 0, single-term-leader)	2m 55s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	51s
examples (nightly, raft-kv-rocksdb)	6m 38s
stores (memstore)	42s
stores (rocksstore)	6m 13s
Build (nightly, bench,serde,bt,singlethreaded)	49s
tests-feature-test (nightly)	2m 40s
stores (rocksstore-compat07)	6m 14s
stores (sledstore)	55s
tests-feature-test (nightly, single-term-leader)	2m 43s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 36s
	1h 8m 13s

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