Add Nimbus feature ids fxms-message-16 through 25

[dmose]

Teaches skylight about the feature ids added in Firefox bug 1841277

[Copilot]

Pull Request Overview

This PR adds 10 new Nimbus feature IDs (fxms-message-16 through fxms-message-25) to the messaging experiments default features configuration.

• Extends the MESSAGING_EXPERIMENTS_DEFAULT_FEATURES array with sequential message feature IDs

[netlify]

✅ Deploy Preview for fxms-skylight ready!

Name	Link
🔨 Latest commit	99b835d
🔍 Latest deploy log	https://app.netlify.com/projects/fxms-skylight/deploys/68dc0cbb28bdfc0008c61dc6
😎 Deploy Preview	https://deploy-preview-812--fxms-skylight.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 96 (🔴 down 2 from production) Accessibility: 88 (🔴 down 12 from production) Best Practices: 83 (🔴 down 17 from production) SEO: 100 (🟢 up 10 from production) PWA: - View the detailed breakdown and full score reports

---

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