New context menu can sometimes have multiple items highlighted

With the new context menus, the menu can get in a state where multiple items on the same menu are highlighted. I've only had this happen when moving quickly, but it could indicate missing event processing.

Repro:

1. Create a project
2. Right click the hierarchy view to open a context menu
3. Highlight an item with a sub menu so the sub menu opens
4. Mouse back and forth between the menu and sub menu. Don't be picky about the items you mouse between.

Result: The parent menu can have an active (blue) highlight and inactive (grey) highlight while the sub menu will have an active (blue) highlight

Expected: The parent menu should not have an inactive highlight

Builds tested: 2023.3.0a12, 2023.3.0a11, 2023.2.0b15

OS tested: macOS (This may be cross-platform. I haven't tested Windows and Linux.)