Lock on the cleanNode function

[arvid220u]

Summary

It is possible for cleanNode to be called recursively. This PR adds a simple isCleaning lock to ensure that cleanNode isn't called on the same node twice.

Minimal example: https://playground.solidjs.com/anonymous/9f860e26-d0a3-476d-8b20-82ebff4763d7 (when you click "hide", you get a Cannot read properties of null error which comes from cleanNode being called twice on the same node).

I believe this error is most likely to happen when your entire app isn't in Solid, but you're instead mounting several Solid roots inside an existing application. We have global state controlling which Solid roots and components to show, and a syncState function that reads from the global state and disposes/creates Solid roots based on that. If component A has a Show that causes component B to be disposed, and component B has an onCleanup that calls the global syncState which disposes the entire Solid root that A is rendered in, then A will error in the cleanNode function.

I believe that this change should solve this problem, but I would love input on whether this change is reasonable at all, or whether it may have side effects that I haven't considered.

Thank you!

How did you test this change?

Would love advice on where you think it'd be best to add a test for this — didn't do it yet, because would first love input on whether this change makes sense.

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[ryansolid]

I think it does. The only challenge is concurrency. That being said I don't think it changes the desire for this. Just it complicates things a bit.