Integrate new navigation

[AlistairGempf]

Overall change:
There are a number of issues that need to be resolved in order to be able to release the new navigation. These are:

• Integrate Psammead components and handle state for AMP and Canonical. (Navigation Integration #4571 and Navigation: AMP dropdown integration and dropdown toggling #4570)
• Add entry and exit animation for navigation dropdown, for AMP and Canonical. (Navigation: Dropdown Entry and Exit Animations #4579)
• Move skip to content link from navigation to brand component (Bump @bbc/psammead-timestamp-container from 2.1.0 to 2.3.1 #2829)
• Use script link into the brand component (Use Brand with Script Link component on services with variants #4009)

We have created a feature branch so we can review these changes incrementally, rather than having one large review when we are ready for these to go live.

These pull requests handle aspects of this:

In Progress
Integrate canonical navigation animation #5057

Then:

• Incorporate changes from Remove aria-hidden from scrollable navigation (Remove aria-hidden from scrollable navigation BBC-archive/psammead#2875)
• Modify e2es
• Investigate Cookie redirects do not work on mobile and desktop #5038
• Fix script link padding on small devices: Padding missing below script link on small screen widths #5062

Done
Navigation: add unit tests and refactor AMP constants #4968
Update nav translations #4969
Spread Navigation props #2802
Add a comment about the hidden attribute #4952
Ensure Nav is always red on desktop #2810
Move media query hooks to Simorgh #2801
Use Brand with Script Link component on services with variants #4948

As well as these issues, which were completed before we decided to use a feature branch:
Navigation: Canonical dropdown integration and dropdown toggling #4571
Navigation: AMP dropdown integration and dropdown toggling #4570

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• I have assigned myself to this PR and the corresponding issues
• Automated (jest and/or cypress) tests added (for new features) or updated (for existing features)
• If necessary, I have run the local E2E non-smoke tests relevant to my changes (CYPRESS_APP_ENV=local CYPRESS_SMOKE=false npm run test:e2e:interactive)
• This PR requires manual testing - we will require cross browser testing across browser matrix