Simplify Publishing.props

[ViktorHofer]

[wtgodbe]

I see this changes NonShipping=true to IsShipping=false - will that fix issues like the following:

##[error].packages\microsoft.dotnet.arcade.sdk\9.0.0-beta.24168.5\tools\Publish.proj(176,5): error MSB4096: (NETCORE_ENGINEERING_TELEMETRY=Publish) The item "D:\a_work\1\s\artifacts\installers\Release\ancm_iis_express_arm64_en_v2_9.0.0-preview.4.24170.1.msi.sha512" in item list "ItemsToPushToBlobFeed" does not define a value for metadata "IsShipping". In order to use this metadata, either qualify it by specifying %(ItemsToPushToBlobFeed.IsShipping), or ensure that all items in this list define a value for this metadata.

I think the last Arcade update introduced those