feat(next): updated version view

[AlessioGr]

#11769 improved the lexical version view diff component. This PR improves the rest of the version view.

What changed

• Column layout when selecting a version:
  • Previously: Selected version on the left, latest version on the left
  • Now: Previous version on the left, previous version on the right (mimics behavior of GitHub)
• Locale selector now displayed in pill selector, rather than react-select
• Smoother, more reliable locale, modifiedOnly and version selection. Now uses clean event callbacks rather than useEffects
• React-diff-viewer-continued has been replaced with the html differ we use in lexical
• Updated Design for all field diffs
• Version columns now have a clearly defined separator line
• Fixed collapsibles showing in version view despite having no modified fields if modifiedOnly is true

Screenshots

Before

After