refactor(bb): IPA parallelization cleanup #17351

Job	Run time
changes	7s
setup / start-builder	1m 59s
build-images	3s
acir-bench	0s
build	0s
bb-native-tests	16m 58s
bb-gcc	5m 3s
noir-format	0s
noir-build-acir-tests	20s
bb-js-test	15m 47s
noir-examples	9m 31s
avm-format	0s
noir-packages-test	27m 16s
bb-bench	12m 49s
noir-test	0s
docs-preview	0s
l1-contracts-test	0s
protocol-circuits-gates-report	20m 22s
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-honk	10m 38s
bb-acir-tests-bb	26m 45s
bb-acir-tests-sol	11m 44s
bb-acir-tests-bb-js	21m 50s
merge-check	1s
rerun-check	1s
notify	0s
	3h 1m 14s

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