Customer feedback | az image | --cleanup needs a better warning

This GitHub issue is being moved from MicrosoftDocs/azure-docs-cli [4619](https://github.com/MicrosoftDocs/azure-docs-cli/issues/4619) so that the engineering team can respond.

### Reference command
az image copy

### Request
Please add a warning / confirmation prompt to `az image copy --cleanup` and `--temporary-resource-group-name`

### Customer feedback
"
if you use az image copy with the "--cleanup" and "--temporary-resource-group-name" parameters and reference an existing resource group, that resource group and all of its content will be deleted.

I guess a note of warning would be nice.
"

### Page URL

https://learn.microsoft.com/en-us/cli/azure/image?view=azure-cli-latest

### Content source URL

https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/latest/docs-ref-autogen/image.yml