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Bug: A sync ping in render phase unwinds the stack
I found this bug when working on a different task. `pingSuspendedRoot` sometimes calls `prepareFreshStack` to interupt the work-in-progress tree and force a restart from the root. The idea is that if the current render is already in a state where it be blocked from committing, and there's new data that could unblock it, we might as well restart from the beginning. The problem is that this is only safe to do if `pingSuspendedRoot` is called from a non-React task, like an event handler or a microtask. While this is usually the case, it's entirely possible for a thenable to resolve (i.e. to call `pingSuspendedRoot`) synchronously while the render phase is already executing. If that happens, and work loop attempts to unwind the stack, it causes the render phase to crash. This commit adds a regression test that reproduces one of these scenarios.
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