feat(artifacts): Default to latest tag if not provided

[ninja-quokka]

This change implements a feature where podman artifacts will default to using the 'latest' tag if no tag is provided by the user. This aligns the behavior of artifacts with that of container images, providing a more consistent user experience.

Fixes: #27083

Does this PR introduce a user-facing change?

Podman Artifact commands now default to using the latest tag when one isn't provided

[packit-as-a-service]

[NON-BLOCKING] Packit jobs failed. @containers/packit-build please check. Everyone else, feel free to ignore.

[rhatdan]

I would like to see some system tests of E2E test.

podman artifact create foobar /PATH/TO/object
podman artifact ls
Make sure the latest tag is added ,for example.

[rhatdan]

Why is this in Draft? What is it waiting for?

[rhatdan]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ninja-quokka, rhatdan
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[rhatdan]

@ninja-quokka needs a rebase.