refactor(ui5-menu): remove references to parent

[didip1000]

Refactored ui5-menu closing and navigation handling, removing references to the parent element:

• MenuItems now close their own submenus when necessary.
• Exiting end content navigation with the up/down arrow keys with throw an exit-end-content event, which is handled by the parent Menu or MenuItem.
• Fixed an issue with menu item navigation when holding down space on a MenuItem with a submenu.

[hinzzx]

Also, please re-base to main branch since few WDIO tests are failing, I believe due to old ChromeDriver version.

[hinzzx]

it looks good from my side