engsys: idempotent publishing for re-runs

[weikanglim]

Is there a general strategy we can make artifact publishing idempotent to job re-runs?

Example:

In publish-cli.yml (and anywhere else), when we have a pipeline artifact being published:

  - task: 1ES.PublishPipelineArtifact@1
    inputs: 
      targetPath: release
      artifact: UploadedReleaseArtifacts

And in a subsequent step such as create-pull-request, fails due to a flaky issue. On a rerun, we will get an error:

##[error]Artifact UploadedReleaseArtifacts already exists for build 4153919.

Here's a recent build run demonstrating this issue.