Faster Apple Silicon Scaleway node provisioning by reusing the cached golden base

The Scaleway Apple Silicon provider now reuses the cached golden base image when provisioning new VM nodes, instead of re-downloading it. A parsing bug made the warm-path probe incorrectly treat the on-disk golden as absent, so every node recycle triggered a full multi-GB re-pull. With the fix, recycles clone the golden base locally and provisioning of Apple Silicon Scaleway nodes drops from minutes to seconds.