Removes a child, at the provided index, from the contentContainer of the current element.
Removes the element from both the child list and the layout list. This also releases the rendering data of the element at the index
and its descendants. As a result, this is an O(n) operation where n is the total number of
descendants.
If the index is out of range, an exception will be thrown.
Note: Avoid removing an element during a layout pass to prevent invalid operation exceptions and potential side effects.