Convert to .slnx

[stefannikolei]

Converts the Solution File to the new cleaner Format.

[JimBobSquarePants]

Slnx requires .NET 10 for stable support does it not?

[stefannikolei]

Slnx requires .NET 10 for stable support does it not?

Yeah... I could install the .net10 sdk for the .net8 build. Or just throw this PR away until .net8 is dropped

[gfoidl]

Slnx requires .NET 10 for stable support does it not?

.NET SDK 9.0.200 introduced it.

In .NET 10 only dotnet new sln defaults to the slnx format.

[JimBobSquarePants]

Slnx requires .NET 10 for stable support does it not?

.NET SDK 9.0.200 introduced it.

In .NET 10 only dotnet new sln defaults to the slnx format.

Yes but in our CI we explicitly use only the single .NET 8 SDK for non-preview entries. I need to ensure everything still works there.

Tests are currently failing though because TestEnvironment explicitly looks for the sln extension as it searches for the solution directory. If everything works after that I’m happy as long as VS 2022 can open it.

[stefannikolei]

Closed for now. .net8 target should only be built with installed .net8 sdk and not with net8 and net10 sdk