dont generate docs for tests

[SimonCropp]

speeds up the build and the ide.
and reduces noise in the build output and the ide

[ViktorHofer]

error EnableGenerateDocumentationFile: (NETCORE_ENGINEERING_TELEMETRY=Build) Set MSBuild property 'GenerateDocumentationFile' to 'true' in project file to enable IDE0005 (Remove unnecessary usings/imports) on build (dotnet/roslyn#41640)

Apparently there's a reason to keep it getting produced. The usings analyzers depends on it. Given that, I would just keep them.

[SimonCropp]

i would argue that analyser is flawed if it needs xml docs to work out redundant usings.

[ViktorHofer]

Yeah. See dotnet/roslyn#41640 for more information.