crane: make delete idempotent

[rgl]

Describe the bug

When using crane to delete images inside some kind of automation pipeline, it would be nice if crane delete would consider non-existent deletes as a successful result instead of erroring out.

This would be useful when a Human manually deletes a image from a registry, and later, the automation that calls crane will also try to delete that image. In this case, since the image is already deleted, crane should accept that as a successful result.

To Reproduce

1. Upload/Copy an image to a ECR repository, e.g.: crane copy "$source_image" "$target_image".
2. As a Human, at the ECR repository, delete the uploaded image.
3. Delete the image using crane, e.g.: crane delete "$target_image".
4. See crane error out with: MANIFEST_UNKNOWN: Requested image not found.

Expected behavior

Since the image is already deleted, crane delete should consider that case as a non-error, and return successfully.

Additional context

The full example is at https://github.com/rgl/pulumi-typescript-aws-native-ecr-example. The crane delete command is at https://github.com/rgl/pulumi-typescript-aws-native-ecr-example/blob/main/ecr-image.sh (which is called from https://github.com/rgl/pulumi-typescript-aws-native-ecr-example/blob/main/images.ts (look for ecr-image.sh for the exact place)).

• Output of crane version: 0.17.0
• Registry used: ECR

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