Add Authorization header to Reader Revenue /header request

[juabara]

What

This PR updates the TopBarSupport component to send the user's Authorization token when fetching the Reader Revenue header if they are signed in.

Why

To allow the /header endpoint on the contributions service to authenticate the user and return appropriate personalized header content (e.g., hiding support messaging for supporters, or showing specific sign-in/supporter prompts).

Changes:

• src/lib/sdcRequests.ts: Updated the getHeader signature to accept an optional headers?: HeadersInit argument and pass it down to getModuleData.
• src/components/TopBarSupport.importable.tsx:
  • Replaced the external getHeader import from @guardian/support-dotcom-components with our local implementation to allow passing custom headers.
  • Replaced useIsSignedIn() with useAuthStatus() to access the full authentication state, including the access token.
  • Passed the computed Authorization headers (via getOptionsHeaders) into the getHeader fetch request when authStatus.kind === 'SignedIn'.

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[github-actions]

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From guardian/actions-riff-raff.