feat(appimage): If necessary, start with --no-sandbox.

[sabonerune]

fix electron-userland/electron-builder#8440
The method in electron-userland/electron-builder#4496 has the following drawbacks:

• Doesn't work without desktop integration
  The AppImage can be launched without desktop integration.
  It also doesn't work when started from the command line.
• Sandbox is always disabled
  user namespace should now be available on many Linux systems.
  This means that --no-sandbox is only needed in limited environments.
  Even in Ubuntu 24.04 or later, starting from file manager bypasses AppArmor restrictions, so --no-sandbox is not required.
  https://discourse.ubuntu.com/t/understanding-apparmor-user-namespace-restriction/58007#p-148026-bypassing-apparmor-security-restriction
  It's also possible that the user has disabled AppArmor.

This solves these problems by automatically detecting when the user namespace is unavailable and adding --no-sandbox at runtime.

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Latest commit: bf90761

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

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Name	Type
app-builder-bin	Minor

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