Add shortcut to return to homepage

What does this MR do and why?

This change adds a new keyboard shortcut (Shift+H) that allows users to quickly navigate to the homepage from anywhere in the application. When pressed, it finds and clicks the brand logo link, which typically takes users back to the main homepage. The feature includes proper internationalization support for multiple languages, comprehensive test coverage to ensure it works correctly, and integrates seamlessly with the existing keyboard shortcut system alongside other navigation shortcuts.

References

#553938 (comment 2739212077)

How to set up and validate locally

1. Enable the personal_homepage feature flag
2. Go somewhere
3. Press shift+h

MR acceptance checklist

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