📎 (SolidJS) createEffect and createMemo should only return once

[marvin-j97]

Description

I don't think this is part of #2438 but would be another useful rule. Basically, when having diverging control flow in an effect or memo, a dependency may not be tracked, which could (partially) break reactivity. If an effect handler has some conditionals, it should either hoist the signal accesses to the top, or use on (https://docs.solidjs.com/reference/reactive-utilities/on-util#on).

More info: https://docs.solidjs.com/advanced-concepts/fine-grained-reactivity#managing-lifecycles-in-a-reactive-system