[menu-bar] Improve popover height calculations when using multiple displays

[gabrieldonadel]

Why

We always had issues with resizing the Popover height accurately, but after upgrading react-native-macos to 0.73 this has become more apparent, often cropping the "Quit" button on the UI

How

In react-native-macos to 0.73 Dimensions.get('screen') no longer returns the actual screen size on the first few renders (microsoft/react-native-macos@d1ed53d), so instead of relying on multiple retries this PR refactor useSafeDisplayDimensions to not use the Dimensions API.

By exporting the initial screen size as a constant in MenuBarModule and including the screen size in the body of the popoverFocused event we can ensure that the screen size data is always up to date.

Test Plan

1. Open the Popover on a second monitor
2. Put your Mac to sleep from the second monitor
3. Unplug the monitor
4. Wake up your Mac and press the Orbit Icon on the menu bar
5. Ensure the devices list is displayed correctly