feat(xo-web/VM): display accurate Secure Boot status

[MelissaFrncJrg]

Description

Fixes #7495

Checklist

• Commit
  • Title follows commit conventions
  • Reference the relevant issue (Fixes #007, See xoa-support#42, See https://...)
  • If bug fix, add Introduced by
• Changelog
  • If visible by XOA users, add changelog entry
  • Update "Packages to release" in CHANGELOG.unreleased.md
• PR
  • If UI changes, add screenshots
  • If not finished or not tested, open as Draft

[stormi]

Most things work well, but I found a few issues, and there's also something important from the specs that is missing : "This should be displayed both in the general VM view, because it's an important piece of information, and also below the Secure Boot switch in the Advanced view of the VM, updated whenever someone changes the switch's state." (by "general VM view", I meant the VM's "General" tab).

[pdonias]

Nothing to add.

This will need to be tested again end-to-end after the latest changes.
Don't forget to add xo-server in the commit message's scope.

[stormi]

In the General tab, I still see "SecureBoot status: " on BIOS VMs, as well as on VMs running on XCP-ng 8.2. There should be nothing instead, as decided on thursday during the daily meeting.

[julien-f]

Server-side lgtm.

[stormi]

Tests OK on my side.

PR co worker