ff cleanup: deprecate_unused_legacy_vote_plumbing (#2585) #112

Job	Run time
benchmark (solana-sdk, cargo +$rust_nightly bench -p solana-sdk)	1m 29s
benchmark (solana-runtime, cargo +$rust_nightly bench -p solana-runtime)	1m 12s
benchmark (solana-gossip, cargo +$rust_nightly bench -p solana-gossip)	3m 19s
benchmark (solana-poh, cargo +$rust_nightly bench -p solana-poh)	1m 36s
benchmark (solana-core, cargo +$rust_nightly bench -p solana-core)	5m 40s
benchmark (sbf, make -C programs/sbf all, cargo +$rust_nightly bench --manifest-path programs/sbf...	1m 37s
benchmark (solana-accounts-db, cargo +$rust_nightly bench -p solana-accounts-db --bench accounts_...	13m 34s
	28m 27s

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