Improves foundations for Upcoming Split Screen changes
fixes: #29953
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## Summary by CodeRabbit
- **New Features**
- Added new routing for list views and full-screen modes in the IDE.
- Introduced `SplitScreenRoutes` and `FullScreenRoutes` components for
enhanced query editing experience.
- Implemented new `ListWidgets` component for managing widgets within
the editor.
- New `Container`, `FullScreenTabs`, and `SplitScreenTabs` components
for better tab management in the IDE.
- Added functionality to render JavaScript editor and list view based on
IDE view mode settings.
- **Enhancements**
- Updated the IDE with a new `EditorTabs` component replacing
`FileTabs`.
- Improved editor pane with dynamic width adjustment and side-by-side
view capability.
- Enhanced segmented header with new options and conditional button
rendering.
- **Refactor**
- Renamed `EditorViewMode` enum value from `HalfScreen` to
`SplitScreen`.
- Updated message constants across various components for consistency.
- Reorganized import paths and component names for better structure and
readability.
- Removed unused code and updated import statements for `EmptyState`
components.
- Consolidated editor pane text constants for unified messaging.
- **Bug Fixes**
- Fixed routing issues by integrating new paths and components based on
editor settings.
- Resolved inconsistencies in widget list management and editing
features.
- Corrected message references in `JSBlankState` and `QueriesBlankState`
components.
- **Documentation**
- Updated class and ID names in the codebase for clarity.
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