https://learn.microsoft.com/en-us/powershell/module/az.containerregistry/remove-azcontainerregistrymanifest?view=azps-15.6.0
Remove-AzContainerRegistryManifest (Az.ContainerRegistry) | Microsoft Learn
Delete ACR manifest. To use this cmdlet please run Update-AzContainerRegistryRepository -RegistryName XXX -Repository XXX -DeleteEnable $true first.
removeazmicrosoftlearn