This change adds the ability to delete a specific platform from a
multi-platform image.
Previously, image deletion was an all-or-nothing operation - when
deleting a multi-platform image, all platforms would be removed
together. This change allows users to selectively remove individual
platforms from a multi-architecture image while keeping other platforms
intact.
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
30da69d694