issue-2808 Release notes pages not operational for april releases

[xavierfacq]

Description of change

Add more controls on returned release notes or not (err 404). Adapt the message to do not have a spinner forever.

This permits to have 3 "states":

• null it's loading => display a CircularProgress until the query to finish
• isValid = true => we have release notes, let's display data
• isValid = false => data have a problem (404, or deserialize pb, or no data) so display the error message

OK => https://deploy-preview-2809--eclipsefdn-adoptium.netlify.app/fr/temurin/release-notes/?version=jdk-21.0.3+9 KO => https://deploy-preview-2809--eclipsefdn-adoptium.netlify.app/fr/temurin/release-notes/?version=jdk-21.0.3+9321

Checklist

• [X] npm test passes

[netlify[bot]]

✅ Deploy Preview for eclipsefdn-adoptium ready!

Name	Link
🔨 Latest commit	a24d33bac12855b539d2a2a0c390bbd91ed4725a
🔍 Latest deploy log	https://app.netlify.com/sites/eclipsefdn-adoptium/deploys/662b9d37f820d300087f5774
😎 Deploy Preview	https://deploy-preview-2809--eclipsefdn-adoptium.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.