[WebToolsE2E][Green]“No Launchable Target Found” error when debugging

[v-reinawang]

REGRESSION INFO: Worked in April Stable CDK 3.20.197 & pre-release 3.14.196

INSTALL STEPS

OS: Window x64 & Mac arm
Install SDK 8.0.421
Install VS Code insiders - 1.122.0
Install main CDK 3.14.279 (include C#2.143.9)

REPRO STEPS

1. Open vs code > Create Console project
2. Wait for the project loading completed
3. Right-click the csproj then select Debug > Start New Instance

ACTUAL
Get an error message: No launchable target found.

EXPECTED
Can run the project successfully.

Note
This issue only repro on .NET 8.0 + main branch CDK and does not repro on .NET 9.0/10.0 + main branch CDK.

[Susie-1989]

This issue doesn't repro for C# DevKit Prerelease Version 3.32.194(C#2.151.28)
This issue is blocked by bug #3482 in internal main C#devkit 9.9.506-g11c323(C#2.151.28)