Add support for Server 2025

[MichaelSimons]

New Windows Release

Windows version: Server 2025

Related to https://github.com/dotnet/core/issues/9374

Main Branch Tasks

1. • [x] Ensure a "New Windows Release" issue exists for docker-tools repo
2. • [x] Copy the Dockerfiles of the most recent published Windows version for all supported .NET versions and place them in a version-specific folder under their respective variants (runtime, aspnet, sdk)
3. • [x] Modify the Dockerfile templates if there are any specific changes needed that are related to the new Windows version
4. • [x] Update manifest.json to reference the new set of Dockerfiles with the appropriate tags
5. • [x] Update the test data to include the new Windows version
6. • [x] Update the tags metadata templates to include the new Windows version
7. • [x] Run the command to update the READMEs: .\eng\readme-templates\Get-GeneratedReadmes.ps1
8. • [x] Run the command to update the image size baseline file: .\tests\performance\Validate-ImageSize.ps1 -UpdateBaselines
9. • [x] Inspect generated changes for correctness
10. • [ ] Test the images
      1. • [ ] Create a local VM of the new Windows version
      2. • [ ] Clone this repo with the above changes onto the VM
      3. • [ ] Run .\build-and-test.ps1 -OS nanoserver-<VERSION> to build and test your changes for Nano Server
      4. • [ ] Run .\build-and-test.ps1 -OS windowsservercore-<VERSION> to build and test your changes for Windows Server Core
11. • [x] Create PR
12. • [ ] Get PR signoff
13. • [ ] Merge PR and build/publish as part of the main branch release process for the next .NET release
14. • [ ] Create an announcement (example: Nano Server, version 20H2)
15. • [ ] Update the samples to reference the new Windows version:
      • [ ] Nano Server and Windows Server Core sample Dockerfiles
      • [ ] manifest.samples.json

Nightly Branch Tasks

• [ ] Merge these changes to the nightly branch as part of the nightly branch release process for the next .NET release.

[lbussell]

[Triage] Related: https://github.com/microsoft/dotnet-framework-docker/issues/1146

[lbussell]

[Triage] This is blocked on https://github.com/dotnet/dnceng/issues/3781.

[lbussell]

We now have some Server 2025 pools and VM images available. This is now blocked on https://github.com/dotnet/docker-tools/issues/1453.