chore: prepare ScheduledValueChange for mutable delays. #6217

Job	Run time
setup / start-builder	8s
setup / setup	10s
noir-projects	6m 52s
bb-native-tests	11m 36s
build	21m 2s
yarn-project-formatting	19m 43s
bb-bench-binaries	12m 47s
yarn-project-test	12m 41s
setup-bench / start-builder	1m 9s
setup-bench / setup	28s
bb-bench	4m 50s
e2e (e2e-browser)	1m 23s
e2e (e2e-docs-examples)	57s
e2e (e2e-sandbox-example)	1m 32s
e2e (e2e-tests)	11m 54s
e2e (flakey-e2e-tests)	9m 40s
e2e (guides-dapp-testing)	2m 47s
e2e (guides-writing-an-account-contract)	1m 5s
e2e (integration-l1-publisher)	1m 52s
e2e (pxe)	38s
e2e (uniswap-trade-on-l1-from-l2)	6m 4s
merge-check	1s
notify	0s
	2h 9m 19s

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