Update Pallet Referenda to support Block Number Provider #6167

Job	Run time
preflight / preflight	38s
preflight / ci-versions	1m 12s
cargo-check-benches (master)	21m 43s
cargo-check-benches (current)	22m 58s
test-frame-ui	48m 21s
test-full-crypto-feature	2m 56s
cargo-check-all-crate-macos	11m 12s
cargo-check-each-crate (1)	31m 29s
cargo-check-each-crate (2)	26m 5s
test-node-metrics	9m 52s
cargo-check-each-crate (3)	9m 46s
cargo-check-each-crate (4)	25m 26s
cargo-check-each-crate (5)	40m 39s
cargo-check-each-crate (6)	15m 9s
cargo-check-each-crate (7)	36m 59s
test-frame-examples-compile-to-wasm	3m 7s
check-tracing	2m 29s
check-metadata-hash	7m 25s
test-deterministic-wasm	7m 52s
node-bench-regression-guard	14s
All test misc tests passed	1s
	5h 25m 33s

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