Consolidate createDynamicNavMenuList to be used across header & footer with adjustable styling

[snmln]

Context

Need to update existing functionality from the previous header work. To ultimately be component agnostic for both footer and header: #1320 (comment). Also Footer doesn't need dropdowns so clean that up from the logic.

Acceptance Criteria

• Consolidate createDynamicNavMenuList to be used across header & footer
• Expose custom styling
• Remove dropdowns from footer
• Relook at Footer vs Heads defined configs because currently they are consolidated

Related Tickets

Footer refactor
Header refactor