migrate pallet-session-benchmarking to bench V2 syntax #7287

Job	Run time
preflight / preflight	40s
preflight / ci-versions	1m 7s
cargo-check-benches (master)	20m 58s
cargo-check-benches (current)	24m 26s
test-full-crypto-feature	2m 46s
test-frame-ui	47m 2s
test-node-metrics	9m 52s
cargo-check-all-crate-macos	11m 1s
cargo-check-each-crate (1)	22m 48s
cargo-check-each-crate (2)	20m 28s
cargo-check-each-crate (3)	8m 39s
cargo-check-each-crate (4)	20m 17s
cargo-check-each-crate (5)	28m 37s
cargo-check-each-crate (6)	15m 5s
cargo-check-each-crate (7)	29m 3s
test-frame-examples-compile-to-wasm	3m 10s
check-tracing	2m 23s
test-deterministic-wasm	7m 55s
check-metadata-hash	7m 0s
node-bench-regression-guard	15s
All test misc tests passed	1s
	4h 43m 33s

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