feat: new variant for navbar account notif

[bgutsol]

Purpose of PR

• Introduce a new notification 'info' variant for NavbarAccount component. We need it for the new FPC (feature preview center)

⚠️ Changes for the new Light Navbar: https://github.com/contentful/forma-36/pull/2751

PR Checklist

• [x] I have read the relevant readme.md file(s)
• [x] All commits follow our Git commit message convention
• [x] Tests are added/updated/not required
• [x] Tests are passing
• [x] Storybook stories are added/updated/not required
• [x] Usage notes are added/updated/not required
• [x] Has been tested based on Contentful's browser support
• [x] Doesn't contain any sensitive information

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	May 13, 2024 10:24am

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: d88b54243126b1dd40b13a61abc179e2d0b91084

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---------------------- | ----- | | @contentful/f36-navbar | Minor |

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[github-actions[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	132.89 KB (+0.01% 🔺)	2.7 s (+0.01% 🔺)	71 ms (+54.08% 🔺)	2.8 s
Module	129.58 KB (+0.01% 🔺)	2.6 s (+0.01% 🔺)	79 ms (+77.7% 🔺)	2.7 s