Remove resize listener action

[briangregoryholmes]

This PR removes the createResizeListenerFactory module used in various places across the codebase as use:listenToNodeResize. In all instances, this action was used to capture the dimensions of an underlying DOM element. However, Svelte provides a native binding for this (bind:clientHeight and bind:clientWidth) and this PR replaces usage of the action with this binding.

While the Svelte binding has slightly more overhead than ResizeObserver, I propose making this change because it is used so infrequently throughout our codebase, removes the need for creating a store for the observed element, and the native binding will be updated to use ResizeObserver in Svelte 5 (sveltejs/svelte#7583).

That said, we could also replace this with bind:borderBoxSize, which uses the ResizeObserver API already, though it is slightly less ergonomic.

This PR also removes the getEltSize function, which was only used in the Dashboard component and captured the total size of an element including margin. However, the element it was applied to does not have margin to account for.

In a few instances, knowing the dimension of the element is not necessary, but I'll address that in a separate PR.

[ericpgreen2]

Very much like this line of thinking 👍