chore: rename test fixtures internal field: routing_table to nodes #2768

Job	Run time
cluster-benchmark (cluster_benchmark)	46s
examples (stable, raft-kv-memstore)	2m 18s
examples (stable, raft-kv-rocksdb)	7m 56s
external-stores (stores/rocksstore-v2)	5m 45s
examples (nightly, raft-kv-memstore)	2m 17s
examples (nightly, raft-kv-rocksdb)	12m 1s
lint	6m 42s
openraft-feature-test (nightly)	47s
openraft-feature-test (nightly, serde)	52s
openraft-test (stable, 0)	3m 0s
openraft-test-bench (nightly)	53s
openraft-test (nightly, 30)	3m 9s
openraft-feature-test (nightly, single-term-leader)	51s
openraft-test (nightly, 0, single-term-leader)	2m 57s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	54s
stores (memstore)	42s
Build (nightly, bench,serde,bt,singlethreaded)	47s
stores (rocksstore)	5m 58s
stores (rocksstore-compat07)	6m 6s
tests-feature-test (nightly)	2m 45s
stores (sledstore)	53s
tests-feature-test (nightly, single-term-leader)	2m 41s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 42s
	1h 13m 42s

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