Fix issue with top bar menu having unique ARIA roles (2)

[gziolo]

Description

Opened in place of #13059. Continues work started by @Firestorm980.

Closes #12505. Adds role options to menus so that the items within the main more menu can now be groups within the menu. Should fix issues with keyboard navigation as well as roles. The menu options/props default to what they used to be, so if it isn't specified and these menus are used elsewhere, it should fallback to the old functionality.

How has this been tested?

• Manual keyboard navigation testing in the admin with VoiceOver.
• Ran test-e2e within Gutenberg docker.

Types of changes

• Updates menu group component to have a default role, label, and keyboard event control
• Changes menus used in the top nav to use group instead of menu and wraps within a parent menu
• Changes menus used in the top nav to let the parent menu handle overall keyboard event navigation

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[gziolo]

Closing this one as #13059 got updated. Props to @Firestorm980 🎉