[ContainerRegistry] Potential updates to delete images sample

[jeremymeng]

• delete tags before deleting manifests PR [ContainerRegistry] Update delete image sample #16002
  • related .NET tracking issue: [ACR] Delete Sample: delete tags before manifests azure-sdk-for-net#21675
• investigate whether parallelization applies to JS
  • related .NET tracking issue: [ACR] Link to .NET 6 Parallelization from Delete Sample azure-sdk-for-net#21820
  • We are single-threaded. We could do Promise.all() but we would be hitting service too frequently if we don't throttle the outgoing request. For this sample I decide to keep it as running in series.