### Description
The local build of the native library was being included by almost every
project, but is only needed to run tests. Due to the multiple inclusions
attempting to use a pre-built package was clashing with any local builds
that were available.
Create a helper file to include either a local built of a pre-built
package and include that in the two test projects.
Cleanup various miscellaous things.
### Motivation and Context
Create setup to simplify running on-device tests with the nuget
packages.
