elastic scaling: add core selector to cumulus (#5372) #1388

Job	Run time
preflight / preflight	10s
cargo-check-all-crate-macos	11m 10s
cargo-check-benches	0s
test-frame-ui	31m 1s
cargo-check-each-crate (1)	15m 38s
test-full-crypto-feature	2m 31s
cargo-check-each-crate (2)	16m 53s
cargo-check-each-crate (3)	4m 49s
test-node-metrics	8m 10s
cargo-check-each-crate (4)	13m 35s
cargo-check-each-crate (5)	20m 6s
cargo-check-each-crate (6)	13m 29s
cargo-check-each-crate (7)	25m 2s
node-bench-regression-guard	5s
test-frame-examples-compile-to-wasm	3m 3s
test-deterministic-wasm	6m 26s
check-tracing	2m 21s
check-metadata-hash	6m 4s
cargo-hfuzz	2m 51s
All test misc tests passed	1s
	3h 3m 25s

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