chore(deps): update dependency microsoft.testing.platform.msbuild to v2

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Microsoft.Testing.Platform.MSBuild	nuget	major	1.9.1 → 2.1.0

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Release Notes

microsoft/testfx (Microsoft.Testing.Platform.MSBuild)

v2.1.0

See release notes here.

v2.0.0

1. Implemented 'AddResultFile' for NetCore TestContext (#​609)
2. Datarow tests - support methods with optional parameters (#​604)
3. Implemented Initialize Inheritance for ClassInitialize attribute (#​577)
4. Apply TestCategory from derived class on inherited test methods (#​513)
5. Fixed IsNotInstanceOfType failing when objected being asserted on is null (#​622)
6. Setting MapNotRunnableToFailed to true by default (#​610)

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