Target .NET 10 / net10.0

[ViktorHofer]

This issue tracks the infrastructure work that is required to target net10.0 for producing .NET 10 builds. The work tracked here usually starts happening when we branch-off main for .NET 9 RC2 in mid August.

Phase 1 - Branding

The branding work needs to happen in a separate PR from the re-targeting work and must not update the assembly version. This means that the AssemblyVersion property needs to be hardcoded to 9.0.0.0 here: https://github.com/dotnet/runtime/blob/d8a642fb46a6a047ef7c6c9c0e16b09674570c33/eng/Versions.props#L22

• [ ] Status box. Tick to mark phase 1 as completed.

Phase 2 - Re-targeting

After the branding work is done, the TFM re-targeting work can happen. There's a long list of things to do. For reference, here's the PR from last year for net9.0.

• [ ] Add dotnet10 & dotnet10-transport NuGet feeds.
• [ ] Update TFM properties so that NetCoreAppCurrent=net10.0, NetCoreAppPrevious=net9.0 and NetCoreAppMinimum=net8.0.
• [ ] Update the globally set AssemblyVersion back to $(MajorVersion).$(MinorVersion).0.0.
• [ ] Update the ApiCompat baseline versions to the latest officially released package version (should be P7 if this is worked on in August). Add a TODO marker and file an issue to track updating this version to 9.0.0 GA in November.
• [ ] Update hardcoded 9.0.0.0 assembly versions in CompatibilitySuppressions.xml files (APICompat config).
• [ ] Remove the DisablePackageBaselineValidation property and its comment so that we have APICompat validation for new packages during re-targeting.

WIP - Add more to this list

Phase 3 - Clean-up

• [ ] Eventually remove net9.0 NuGet feeds when all moving dependencies are on the dotnet10 feeds: https://github.com/dotnet/runtime/issues/106593
• [ ] Change set(PRERELEASE 1) to 0 in eng/native/configureplatform.cmake in the release/9.0 branch so new compiler warnings don't fail the servicing build.

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