DS implementation - Unify CalloutBanner to match DS specs

[pettinarip]

Description

Refactor the CalloutBanner to match ds version and unify all the instances using it.

List of pages where we are using a CalloutBanner.

• https://deploy-preview-12911--ethereumorg.netlify.app/en/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/contributing/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/staking/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/dapps/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/eth/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/get-eth/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/stablecoins/
• https://deploy-preview-12911--ethereumorg.netlify.app/en/developers/learning-tools/

[netlify]

✅ Deploy Preview for ethereumorg ready!

Name	Link
🔨 Latest commit	bbf3f12
🔍 Latest deploy log	https://app.netlify.com/sites/ethereumorg/deploys/66573fd4ad10fb0008a9a865
😎 Deploy Preview	https://deploy-preview-12911--ethereumorg.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	7 paths audited Performance: 49 (🟢 up 11 from production) Accessibility: 92 (no change from production) Best Practices: 89 (🔴 down 3 from production) SEO: 93 (no change from production) PWA: - View the detailed breakdown and full score reports

---

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