Update colors in the design system to match SB 7.0

I matched the colors best I could. Most are 1:1. The biggest exception is the tertiary color. For the Design System, it should be a darker grey - for Storybook a lighter grey. That has more to do with the major stylistic differences in the two buttons. We could potentially reconcile those, but that would be a larger change than just colors.

📦 Published PR as canary version: 7.11.1-canary.401.c1ebd15.0

:sparkles: Test out this PR locally via: ```bash npm install @storybook/design-system@7.11.1-canary.401.c1ebd15.0 # or yarn add @storybook/design-system@7.11.1-canary.401.c1ebd15.0 ```

storybookjs / design-system

Update colors in the design system to match SB 7.0 #401