refactor(bb): use std::span in pippenger for scalars #18180

Job	Run time
changes	7s
setup / start-builder	22s
build-images	4s
acir-bench	0s
bb-native-tests	17m 58s
bb-gcc	7m 58s
bb-js-test	12m 17s
build	0s
noir-build-acir-tests	7m 18s
noir-examples	9m 58s
noir-format	0s
noir-packages-test	26m 35s
noir-test	0s
avm-format	0s
bb-bench	15m 19s
l1-contracts-test	0s
docs-preview	0s
protocol-circuits-gates-report	19m 56s
e2e	0s
network-e2e	0s
bench-e2e	0s
noir-projects	0s
yarn-project-formatting	0s
boxes	0s
prover-client-test	0s
yarn-project-test	0s
bench-summary	0s
boxes-test	0s
bb-acir-tests-sol	8m 26s
bb-acir-tests-bb-js	12m 21s
bb-acir-tests-sol-honk	9m 43s
bb-acir-tests-bb	22m 48s
rerun-check	1s
merge-check	1s
notify	0s
	2h 51m 12s

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