hx-target and hx-swap prevent hx-on::xhr:loadend from firing.

# The Problem
When an Element has a `hx-swap` or `hx-target` attribute, some of the `hx-on::xhr` - Event seem to stop working.

# Code-Example

```html

# Context
In this case I have a button, that should delete a parent container multiple levels above it.
It should do so, only after the server responded with a successfull response in the 200 range.

So as a `hx-target` I set the parent container. As `hx-swap` I set `delete`.
That part works fine.

But then I also need to update other parts of the Application.
So for that, the idea was to triggering a Javascript function in one of the events.
`hx-on::xhr:loadend` sounded ideal for that.

But as long as the button has the `hx-target` or `hx-swap` attributes `hx-on::xhr:loadend` will not fire.
It only fires, if both attributes are removed.

# Technical analyses
After digging into the code a bit, I think I see, what is happening.
`hx-swap` does its thing (in my case `swapDelete`), before the `hx-on::xhr:loadend` event is fired.

Since the target is a parent element, of the button, the button is cleaned up together with it.
That means the `deInitOnHandlers` is eventually called on the button during the targets cleanup.
Which means, the listener is removed from the Button, before `hx-on::xhr:loadend` can fire.

I don't think I have enough experience with the Project to solve that one. Sorry.