Subtle content switcher 🌳

[laurenmrice]

Acceptance criteria

• This enhancement provides a secondary visual style for the content switcher with lower contrast but still retains enough contrast to meet WCAG requirements and provide the user with an easily identifiable ‘selected’ state.
• We need to create new design tokens for this enhancement, create a final design spec for implementation, and update our documentation in code, the website, and the figma kit.
• We also need to update the corner radius in the high contrast content switcher across the board.

Ref related issue: #7509

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Tasks

Beta Give feedback

1. [Subtle content switcher] Define new color tokens for subtle content switcher #17328
   component: content-switcher role: design ✏️ type: enhancement 💡 +3
2. [Subtle content switcher] Final design specs #17329
   component: content-switcher role: design ✏️ type: enhancement 💡 +3
3. [Subtle content switcher] Implementation #17332
   component: content-switcher role: dev 🤖 type: enhancement 💡 +3
4. [Subtle content switcher] Website docs #17331
   component: content-switcher role: design ✏️ type: enhancement 💡 +3
5. [Subtle content switcher] Figma kit #17330
   component: content-switcher role: design ✏️ type: enhancement 💡 +3

[github-actions]

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