feature/HeaderNavigation types

[mrkjdy]

Closes #13593

Converted UIShell/HeaderNavigation.js to tsx and added appropriate prop types.

Changelog

New

• Added type for HeaderNavigation props

Changed

• Renamed UIShell/HeaderNavigation.js to UIShell/HeaderNavigation.tsx
• Removed a duplicate export of HeaderNavigation that was only used in one place

Testing / Reviewing

You can check this by confirming that there are no errors when:

• building
• viewing the UIShell stories that have a HeaderNavigation
• creating a component that uses the HeaderNavigation and testing which props are valid/invalid

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[tw15egan]

LGTM 👍 ✅