`manifest add`: prefer lists when looking up for `--all`

[nalind]

What type of PR is this?

/kind bug

What this PR does / why we need it:

When looking up the image to add, if we were passed --all, set the flag that we pass to libimage to indicate that we prefer a list if there is one, so that it doesn't just hand us back one image from a list.

How to verify it

Updated test!

Which issue(s) this PR fixes:

Related to https://github.com/containers/podman/issues/27228.

Special notes for your reviewer:

Requires https://github.com/containers/container-libs/pull/382.

Does this PR introduce a user-facing change?

None

[TomSweeneyRedHat]

All kinds of angry red tests @nalind

[nalind]

The updated test won't pass without https://github.com/containers/container-libs/pull/382.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: flouthoc, nalind

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