Use relay chain block number in the broker pallet instead of block number #5606

Job	Run time
preflight / preflight	42s
preflight / ci-versions	1m 10s
cargo-check-benches (master)	21m 55s
cargo-check-benches (current)	24m 33s
test-frame-ui	46m 29s
cargo-check-all-crate-macos	12m 26s
cargo-check-each-crate (1)	26m 21s
test-full-crypto-feature	2m 36s
cargo-check-each-crate (2)	21m 46s
cargo-check-each-crate (3)	9m 3s
test-node-metrics	12m 9s
cargo-check-each-crate (4)	22m 38s
cargo-check-each-crate (5)	30m 44s
cargo-check-each-crate (6)	14m 58s
cargo-check-each-crate (7)	32m 0s
test-frame-examples-compile-to-wasm	3m 4s
test-deterministic-wasm	7m 56s
check-tracing	2m 23s
check-metadata-hash	6m 59s
node-bench-regression-guard	14s
All test misc tests passed	1s
	5h 0m 7s

Provide feedback