Enabling Longhorn in any case with capm3 libvirt-metal

Médéric de Verdilhacrequested to merge
enable_longhorn_for_capm3_virt into main

Relative to thread https://sylva-projects.slack.com/archives/C04BQQANHA5/p1713432411008369

Longhorn must be enabled in capm3-virt even in dev environnement since newest os image doesn't fit for use of local-path-provider

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