[provisioning] clean up redundant `Directory.Build.props` for provisioning libraries

Provisioning libraries now have been moved into each serivce's serivce directory.
But they all have a complicated Directory.Build.props, for example: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/datafactory/Azure.Provisioning.DataFactory/Directory.Build.props

We should find a place to store some common properties, so that this file can be simplified.