test: refactor public cross chain tests for speed #6062

Job	Run time
setup / start-builder	1m 8s
setup / setup	1m 2s
bb-native-tests	10m 21s
build	19m 37s
noir-projects	8m 36s
yarn-project-formatting	17m 52s
bb-bench-binaries	11m 36s
yarn-project-test	9m 14s
setup-bench / start-builder	1m 7s
setup-bench / setup	26s
bb-bench	5m 5s
e2e (e2e-browser)	1m 37s
e2e (e2e-docs-examples)	1m 17s
e2e (e2e-sandbox-example)	1m 45s
e2e (e2e-tests)	8m 36s
e2e (flakey-e2e-tests)	4m 12s
e2e (guides-dapp-testing)	3m 10s
e2e (guides-writing-an-account-contract)	1m 13s
e2e (integration-l1-publisher)	2m 11s
e2e (pxe)	48s
e2e (uniswap-trade-on-l1-from-l2)	6m 19s
merge-check	1s
notify	0s
	1h 57m 13s

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