Teleport modal early

[mvorisek]

Improve #2142 and teleport modal (and right panel) at the page load and then on any DOM update (via our JS) immediately.

It should be done recursively as the response is not guaranteed to not contain nested modal placeholders.

Also we can then load the modal early to improve #2143 UX.

[mvorisek]

After #2244 there should be no https://github.com/atk4/ui/blob/4f4729bd25/js/src/Helper/elementRemoveObserver.js#L76 warning emit within all tests - such warning/usecase is dangerous as "remove handler" is triggered which may abort some async handlers like outgoing API connection.

Can be reproduced on /demos/data-action/jsactionsgrid.php demo with "Edit ISO3".

(1st and (repeated) 2nd click)