Order .NET Core unit tests

Bump NUnit3TestAdapter in /csharp/unit-testing/NUnit.TestProject (#3730)

Bumps [NUnit3TestAdapter](https://github.com/nunit/nunit3-vs-adapter) from 3.16.1 to 3.17.0.
- [Release notes](https://github.com/nunit/nunit3-vs-adapter/releases)
- [Commits](https://github.com/nunit/nunit3-vs-adapter/compare/V3.16.1...V3.17)

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