Publish ReleaseConfigs Artifact does not support rerun

On first attempt Publish Assets failed during `Publish using Darc`. Upon rerun `Publish ReleaseConfig Artifact` failed with "##[error]Artifact ReleaseConfigs already exists for build 3024543."

Run: https://dev.azure.com/dnceng/internal/_build/results?buildId=3024543&view=logs&j=dba8c5c4-bab9-551d-cb64-41450f502586&t=b735bcbb-5c6a-5de4-8057-49e031a7cc95&l=40

Start with the Publish Assets pipeline and the Publish using Darc and Publish ReleaseConfig Artifact steps, using build 3024543's logs as the reproduction. Trace what happens when the first attempt partially succeeds, then rerun the publish; done means the rerun completes without the "Artifact ReleaseConfigs already exists" error.

Written by the indexing model from the issue text.