Handle default system connection transfer properly on machine removal

[jakecorrenti]

Changes system connection removal so the following case now works as expected:

• Rootless podman machine 1 is initialized and running.
• Rootful podman machine 2 is initialized.
• Delete podman machine 1.
• The rootful system connection associated with podman machine 2 now becomes the default, not the rootless.

Fixes: #22577

Does this PR introduce a user-facing change?

When a user has a rootless machine running and another rootful podman machine initialized, and the rootless machine is removed, the rootful system connection associated with the podman machine now becomes the default as expected.

[baude]

ok , LGTM (one question)

[packit-as-a-service[bot]]

Ephemeral COPR build failed. @containers/packit-build please check.

[jakecorrenti]

~something's wrong with my macOS env... I don't think this will end up passing the test. Looking into it~

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jakecorrenti, Luap99

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