Podman 6: machine usability improvements

Podman 6 introduces significant usability improvements to its machine functionality by abstracting away provider complexity—users can now manage virtual machines by name alone regardless of the underlying virtualization provider (WSL, HyperV, QEMU, Libkrun, or Applehv), eliminating cross-platform friction and CLI/Desktop inconsistencies. This enhancement reduces operational overhead for IT teams managing containerized workloads across heterogeneous infrastructure while improving developer experience and reducing support burden from provider-specific command variations. The default behavior now surfaces all available machines across providers simultaneously, streamlining machine discovery and management for organizations running multi-provider container deployments.