Ensure Virtual Host Manager page works with an unknown provider

[mackdk]

What does this PR change?

When creating a virtual host manager, the list of provider is retrieved by calling virtual-host-gatherer --list-providers. This list however is also hard-coded in the typescript page for translation purposes. If a provided returned by virtual-host-gatherer is not present in the hard-coded list, currently the UI shows an empty entry in the Create button dropdown menu, making it impossible for the user to select it. This is currently happening for Libvirt, but it can happen for every new provider introduced in virtual-host-gatherer.

To address this, this PR ensure the provider is selectable even if it is not present in the hard-coded list and the UI is still fully functional.

GUI diff

Before:

After:
Note: Proxmox is a new provider part of currently open PR in virtual-host-gatherer (uyuni-project/virtual-host-gatherer#40)

• DONE

Documentation

• No documentation needed: bugfix on an already documented feature

• DONE

Test coverage

• No tests: already covered

• DONE

Changelogs

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• Re-run test "schema_migration_test_pgsql"
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• Re-run test "javascript_lint"
• Re-run test "spacecmd_unittests"

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• https://github.com/uyuni-project/uyuni/actions/workflows/acceptance_tests_secondary.yml?query=event%3Aschedule

KNOWN ISSUES

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Happy hacking!
⚠️ You should not merge if acceptance tests fail to pass. ⚠️

[Etheryte]

LGTM. 👍

[srbarrios]

Testsuite changes LGTM.