Iterate on `border-radius` token values and implementation

[lgriffee]

Non breaking changes

• Replace --p-border-radius-half with --p-border-radius-full #8305
• Replace border-radius-base with border-radius-1 #8306
• Replace border-radius large with border-radius-2 #8307

shopify/web

• https://github.com/Shopify/web/pull/83713
• https://github.com/Shopify/web/pull/83712
• Version bump with non breaking changes

Breaking change in v11

• Rename Shape to Border and remove legacy border radius alias values #8304
• Remove v10 legacy custom properties #8374