Refactor: rpc error simulation in tests/ #2764

Job	Run time
cluster-benchmark (cluster_benchmark)	45s
external-stores (stores/rocksstore-v2)	5m 54s
examples (stable, raft-kv-memstore)	2m 17s
lint	6m 32s
openraft-feature-test (nightly)	47s
examples (stable, raft-kv-rocksdb)	7m 48s
openraft-test (stable, 0)	2m 58s
openraft-feature-test (nightly, serde)	55s
examples (nightly, raft-kv-memstore)	2m 7s
openraft-test (nightly, 30)	3m 7s
openraft-feature-test (nightly, single-term-leader)	49s
openraft-test-bench (nightly)	54s
examples (nightly, raft-kv-rocksdb)	6m 45s
openraft-feature-test (nightly, single-term-leader,serde,singlethreaded)	51s
openraft-test (nightly, 0, single-term-leader)	2m 58s
stores (memstore)	41s
Build (nightly, bench,serde,bt,singlethreaded)	47s
stores (rocksstore)	6m 9s
tests-feature-test (nightly)	2m 38s
stores (rocksstore-compat07)	6m 8s
tests-feature-test (nightly, single-term-leader)	2m 45s
stores (sledstore)	57s
tests-feature-test (nightly, loosen-follower-log-revert)	2m 38s
	1h 8m 10s

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