refactor: remove delayUntilRuntimeStage (#94350)
In #93801, we'll be removing `getRuntimeStage` because we want to
differentiate session data and link data, which resolve in different
stages. `delayUntilRuntimeStage` isn't all that useful anyway (we can do
`stagedRendering.delayUntilStage` instead) and gets in the way of that
refactor. This should have no behavior changes otherwise.
