Migrate pallet-scheduler benchmark to v2 #14478

Job	Run time
preflight / preflight	45s
preflight / ci-versions	1m 8s
test-linux-stable-int	9m 37s
test-linux-stable (1/3, parity-large)	34m 27s
test-linux-stable-runtime-benchmarks	31m 31s
test-linux-stable-no-try-runtime (1/2)	37m 46s
test-linux-stable (1/3, parity-oldlinux)	37m 24s
test-linux-stable-no-try-runtime (2/2)	23m 41s
test-linux-stable (2/3, parity-large)	21m 55s
test-linux-stable (2/3, parity-oldlinux)	17m 52s
test-linux-stable (3/3, parity-large)	21m 29s
test-linux-stable (3/3, parity-oldlinux)	17m 51s
All tests passed	1s
	4h 15m 27s

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