[UI Kit] v12 updates

[sarahill]

This will include token and api changes within polaris.

### Gen 3 styles
- [x] Publish to the Figma community
- [x] Publish internally
- [x] Deprecate or remove old styles
- [x] Create size variables
- [x] Create color variables
- [x] Update shadow tokens
- [x] Update type tokens
- [x] Update/add token references and maps
- [x] Update docs on each style page

### Gen 3 components
- [x] Publish to the Figma community
- [x] Publish internally
- [ ] https://github.com/Shopify/polaris/issues/10479
- [x] Remove scratchpad sections and pages
- [ ] https://github.com/Shopify/polaris/issues/10483
- [x] Add space variables
- [x] `Button` updates
- [x] `ButtonGroup` updates
- [x] `Banner` updates
- [x] `ProgressBar` updates
- [x] Update components to use new Figma variables

Component api updates:

• [Button] Replace booleans with new props #10090
• Button deprecate props #10299
• ButtonGroup - Change segmented to variant, spacing to gap #9981
• Banner - status to tone #10050
• ProgressBar - color to tone #10049
• Layout.Section - replace booleans with new prop #9982