[24.0 backport] c8d/list: Show layerless images

[vvoland]

• Backports: c8d/list: Show layerless images #45587

- What I did
Fix layerless images not being shown in docker images:

- How I did it
Add exception to isImageManifest.

- How to verify it

$ echo 'FROM scratch' | docker build -t chacha -
[+] Building 0.0s (3/3) FINISHED
 => [internal] load .dockerignore                                                                                                                       0.0s
 => => transferring context: 2B                                                                                                                         0.0s
 => [internal] load build definition from Dockerfile                                                                                                    0.0s
 => => transferring dockerfile: 87B                                                                                                                     0.0s
 => exporting to image                                                                                                                                  0.0s
 => => exporting layers                                                                                                                                 0.0s
 => => exporting manifest sha256:a63cf1e09745cbbaca7f82e8447379ff3f1834421711ae386c31468d5510e97c                                                       0.0s
 => => exporting config sha256:63c7db7133a831861b7ec181985a11cbbc29e1c0d4119865095825ecd755f004                                                         0.0s
 => => naming to docker.io/library/chacha:latest                                                                                                        0.0s
$ docker images
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
chacha              latest              a63cf1e09745        1 second ago        604B
$ dd-ctr image ls
REF TYPE DIGEST SIZE PLATFORMS LABELS
REF                             TYPE                                                 DIGEST                                                                  SIZE    PLATFORMS   LABELS
docker.io/library/chacha:latest application/vnd.docker.distribution.manifest.v2+json sha256:a63cf1e09745cbbaca7f82e8447379ff3f1834421711ae386c31468d5510e97c 548.0 B linux/arm64 -

- Description for the changelog

• Fix layerless images not being shown in docker images output with containerd snapshotter enabled

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

LGTM