migrate pallet-nomination-pool-benchmarking to benchmarking syntax v2 #4566

Job	Run time
preflight / preflight	32s
preflight / ci-versions	1m 4s
cargo-check-all-crate-macos	11m 28s
cargo-check-each-crate (1)	22m 44s
test-frame-ui	46m 11s
cargo-check-each-crate (2)	20m 9s
cargo-check-benches (master)	20m 54s
cargo-check-each-crate (3)	7m 40s
test-full-crypto-feature	2m 38s
cargo-check-benches (current)	23m 30s
test-node-metrics	9m 46s
cargo-check-each-crate (4)	19m 56s
cargo-check-each-crate (5)	28m 8s
cargo-check-each-crate (6)	14m 42s
cargo-check-each-crate (7)	28m 38s
test-frame-examples-compile-to-wasm	3m 9s
test-deterministic-wasm	7m 54s
check-tracing	2m 31s
check-metadata-hash	7m 4s
node-bench-regression-guard	15s
All test misc tests passed	1s
	4h 38m 54s

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