[release/5.0.1xx-preview8] Update dependencies from microsoft/vstest

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/microsoft/vstest

• Subscription: 7ed3ff5b-1270-4370-3cc2-08d824643728
• Build: 20200728-02
• Date Produced: 7/28/2020 7:52 AM
• Commit: c4c4491da41cd51039eb64139ec5f26a5a202845
• Branch: refs/heads/master

• Updates:
  • Microsoft.NET.Test.Sdk: from 16.7.0-release-20200612-02 to 16.8.0-preview-20200728-02

[dotnet-maestro]

Auto-Merge Status

This pull request has not been merged because Maestro++ is waiting on the following merge policies.

• ❓ Waiting on checks: dotnet-sdk-public-ci, dotnet-sdk-public-ci (Build Darwin Build_Release), dotnet-sdk-public-ci (Build Darwin Build_Debug), dotnet-sdk-public-ci (Build Windows_NT_FullFramework Build_Release), dotnet-sdk-public-ci (Build Windows_NT Build_Release), dotnet-sdk-public-ci (Build Ubuntu_16_04 Build_Release), dotnet-sdk-public-ci (Build Windows_NT Build_Debug), dotnet-sdk-public-ci (Build Ubuntu_16_04 Build_Debug), dotnet-sdk-public-ci (Build Windows_NT_FullFramework Build_Debug)
• ✔️ Standard Merge Policies Succeeded - No reviews have requested changes.
• ✔️ Standard Merge Policies Succeeded - No version downgrade detected.

[nohwnd]

This will fail because indicators of successful test changes between vstest versions from Unicode to text, and they are used in tests. Ported the changes into #12669 and fixed the tests there.

[dotnet-maestro]

Auto-Merge Status

This pull request has not been merged because Maestro++ is waiting on the following merge policies.

• ❌ Standard Merge Policies Unsuccessful checks: dotnet-sdk-public-ci, dotnet-sdk-public-ci (Build Darwin Build_Release), dotnet-sdk-public-ci (Build Darwin Build_Debug), dotnet-sdk-public-ci (Build Windows_NT_FullFramework Build_Release), dotnet-sdk-public-ci (Build Windows_NT Build_Release), dotnet-sdk-public-ci (Build Ubuntu_16_04 Build_Release), dotnet-sdk-public-ci (Build Windows_NT Build_Debug), dotnet-sdk-public-ci (Build Ubuntu_16_04 Build_Debug), dotnet-sdk-public-ci (Build Windows_NT_FullFramework Build_Debug)
• ✔️ Standard Merge Policies Succeeded - No reviews have requested changes.
• ✔️ Standard Merge Policies Succeeded - No version downgrade detected.