Refactor ContextMenu TestBench to not expose ContextMenuOverlayElement

### Describe your motivation

In https://github.com/vaadin/flow-components/pull/4752 the `ContextMenuOverlayElement` was added and it is used like this:

https://github.com/vaadin/flow-components/blob/75ad92775d939889b0e592a8303675c9b6a1f719/vaadin-context-menu-flow-parent/vaadin-context-menu-flow-integration-tests/src/test/java/com/vaadin/flow/component/contextmenu/it/ContextMenuDemoIT.java#L199-L201

This can be problematic in the future as in V25 we'll switch to native `popover` and the `vaadin-context-menu-overlay` element will no longer be teleported to the `<body>` but instead will always stay inside `vaadin-context-menu` (either in shadow or light DOM, that's yet to be discussed separately).

### Describe the solution you'd like

- Consider removing the `ContextMenuOverlayElement` altogether
- Move methods `getMenuItem(String caption)` and `getMenuItems()` to `ContextMenuElement`
- Add `getOverlay()` to the `ContextMenuElement` using `getPropertyElement("_overlayElement")`
  - This can return `TestBenchElement`, see e.g. `DialogElement` - it's there but is private
  - See also https://github.com/vaadin/flow-components/issues/3677
- Optionally, also consider updating the `openByRightClick()` helper to return `getOverlay()` 

https://github.com/vaadin/flow-components/blob/75ad92775d939889b0e592a8303675c9b6a1f719/vaadin-context-menu-flow-parent/vaadin-context-menu-testbench/src/main/java/com/vaadin/flow/component/contextmenu/testbench/ContextMenuElement.java#L43-L45

### Additional context

The API has to be then backported to v23 in https://github.com/vaadin/flow-components/pull/4754

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Refactor ContextMenu TestBench to not expose ContextMenuOverlayElement #7520

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	private ContextMenuOverlayElement getOverlay() {
	return $(ContextMenuOverlayElement.class).first();
	}

	public static void openByRightClick(TestBenchElement target) {
	target.contextClick();
	}

Refactor ContextMenu TestBench to not expose ContextMenuOverlayElement #7520

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