Restore vendor prefixed font smoothing properties

[t-wright]

Description

In https://github.com/Automattic/vip-design-system/pull/371/files we switched to using an unprefixed font-smoothing property. AFAIK this property still requires the vendor prefixes.

Checklist

• [ ] This PR has good automated test coverage
• [ ] The storybook for the component has been updated

Steps to Test

1. Pull down PR.
2. npm run dev.
3. Open http://localhost:6006/?path=/docs/text--docs
4. Verify the computed styles for any element includes the -webkit-font-smoothing: antialiased (or -moz-osx-font-smoothing: 'grayscale' if using Firefox).

[netlify[bot]]

✅ Deploy Preview for vip-design-system-components ready!

Name	Link
🔨 Latest commit	be7b7444363b95b94ed1540ab6e0a24309c48b2a
🔍 Latest deploy log	https://app.netlify.com/sites/vip-design-system-components/deploys/663da5e59d86e1000858284e
😎 Deploy Preview	https://deploy-preview-397--vip-design-system-components.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.