fix(deb): only execute update-desktop-database and update-mime-database when exists on the system

[mmaietta]

Soft symlink as fallback for update-alternatives to handle when /opt is on a separate partition

Also only execute update-desktop-database and update-mime-database when exists on the system

Fixes: #5721

[changeset-bot]

🦋 Changeset detected

Latest commit: 80b9fb1

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

This PR includes changesets to release 8 packages

Name	Type
app-builder-lib	Patch
dmg-builder	Patch
electron-builder-squirrel-windows	Patch
electron-builder	Patch
electron-forge-maker-appimage	Patch
electron-forge-maker-nsis-web	Patch
electron-forge-maker-nsis	Patch
electron-forge-maker-snap	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[netlify]

✅ Deploy Preview for car-park-attendant-cleat-11576 ready!

Name	Link
🔨 Latest commit	80b9fb1
🔍 Latest deploy log	https://app.netlify.com/sites/car-park-attendant-cleat-11576/deploys/65d65a6496a8720008d3ede0
😎 Deploy Preview	https://deploy-preview-8067--car-park-attendant-cleat-11576.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.