[Epic] `dotnet test` works for .NET MAUI projects

[jonathanpeppers]

Description

Background:

• [Epic] vibe-coding .NET MAUI apps works out of the box #32967
• [testing] dotnet test for maui #33117
• https://github.com/jonathanpeppers/AndroidDotNetTest
• https://github.com/jonathanpeppers/iOSDotNetTest

I'm filing this here as a way to track work across different repos, and have an epic that is specific to dotnet test.

• dotnet/sdk
  • Add $(TargetFramework) selection like dotnet run
  • Add --device selection like dotnet run
• dotnet/android
  • androidtest template, you can dotnet run it: [dotnet test] Add androidtest project template and dotnet run instrumentation support android#10862
  • Add an MTP test adapter, where Microsoft.Android.Run forwards tests from Android. dotnet test works on Android.
• dotnet/macios
  • iostest project template, you can dotnet run it
  • Add an MTP test adapter, where mlaunch forwards tests from iOS. dotnet test works on iOS.
• dotnet/maui
  • Add a cross-platform mauitest project template
• dotnet/skills
  • The "MAUI doctor" skill knows how to check if MTP is enabled and fix if not.
  • Some instruction somewhere, should be explicit that dotnet test works for .NET MAUI test projects
• Future (needs more spec work)
  • Make sure dotnet test telemetry works (or if it needs expanded)
  • Make sure dotnet test "extensions" work, such as the Azure DevOps extension
  • Code coverage (another extension)

(Public) API Changes

None

Usage Scenarios

dotnet new mauitest
dotnet test

Then something amazon happens!

xharness might not be needed for many scenarios:

• https://github.com/dotnet/xharness

Backward Compatibility

n/a

Difficulty

Medium