Add support for Server 2025

[rbhanda]

This issue is created to track progress for the work to enable Windows Server 2025 support for .NET 6.0 and 8.0

Product and Test updates

• [All teams] Do a compatibility check for the product with the new OS
• [Server 2025] - [CoreCLR/CoreFX] Runtime / RID Support update #9419
• [Server 2025] Ensure that the correct Docker images used by teams are built in the dotnet-buildtools-prereqs (if applicable) #9420
• [Infra] Replace docker tags used in builds across repos and branches
• [CLI team] Update CI legs to latest updated Dockerfile
• [Server 2025] - Update test infrastructure to support the new version #9421
• [Acquisition] Add support within nightly repos
• [Acquisition] Deploy to master (GA) during next patch release cycle

Release team:

• Notify .NET Core teams regarding new OS release
• Update release manifest files
• Update the supported OS content on GitHub and marketing sites.

Document updates:

• Add OS prerequisites to the dependencies document
• [Server 2025] - Update distro install page #9422

[richlander]

FYI: https://learn.microsoft.com/windows-server/get-started/whats-new-windows-server-2025

[lbussell]

I filed this issue to get Server 2025 agent pools added: dotnet/dnceng#3781