[menu][popover] Stop event propagation for `Menu.Popup` `onClick` and `onDoubleClick`

# Bug report

## Current behavior

Events from interactions with popups bubble up, which may trigger handlers attached to parent element.

## Expected behavior

The popup should stop event propagation to prevent unintended side effects.

## Reproducible example

https://codesandbox.io/p/sandbox/9jhghq

## Base UI version

beta-1.0.0-beta.0

## Which browser are you using?

Chrome

## Which OS are you using?

Mac OS

## Which assistive tech are you using (if applicable)?

-

## Additional context

In my case I encountered a problem when I had onclick and ondoubleclick handlers somewhere on the parent. Before that I used `Menu` from @mui and everything worked as expected. I think it's worth preventing at least these two events by default.

Workaround - assign handlers with `event.stopPropagation()` manually.