Migrate pallet-preimage to benchmark v2 #7084

Job	Run time
preflight / preflight	42s
preflight / ci-versions	1m 1s
test-frame-ui	47m 2s
cargo-check-each-crate (1)	22m 24s
cargo-check-benches (master)	20m 55s
cargo-check-each-crate (2)	20m 30s
cargo-check-benches (current)	24m 9s
cargo-check-each-crate (3)	8m 37s
test-full-crypto-feature	2m 39s
cargo-check-each-crate (4)	20m 16s
test-node-metrics	9m 47s
cargo-check-each-crate (5)	28m 6s
cargo-check-all-crate-macos	11m 14s
cargo-check-each-crate (6)	14m 58s
cargo-check-each-crate (7)	30m 41s
test-frame-examples-compile-to-wasm	3m 5s
check-tracing	2m 25s
test-deterministic-wasm	7m 57s
check-metadata-hash	7m 14s
node-bench-regression-guard	13s
All test misc tests passed	1s
	4h 43m 56s

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