Add support for Server 2025

[MichaelSimons]

New Windows Release

Windows version: Server 2025

Related to dotnet/core#9374

Prep Tasks

1. • Ensure a "New Windows Release" issue exists for docker-tools repo
2. • Update manifest.json to include entries for the new images
3. • Update manifest.samples.json to include the new Windows version for each of the samples
4. • Update the test data for each of the test classes to include the new Windows version
5. • Run the update-dependencies tool to generate the new Dockerfiles and update all the necessary files:
     • dotnet run --project .\eng\update-dependencies
6. • Inspect generated changes for correctness
7. • 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 windowsservercore-<VERSION> to build and test your changes
8. • Revert any modifications that were made to the 3.5/runtime Dockerfile to support local testing due to the lack of the https://dotnetbinaries.blob.core.windows.net/dockerassets/microsoft-windows.netfx3-.zip file.
9. • Commit generated changes
10. • Create PR
11. • Get PR signoff. Don't merge PR to main.

Release Day Tasks

1. • Create a `microsoft-windows.netfx3-.zip file containing the .NET Fx 3.5 cab installer file and upload it to the blob storage location.
2. • Follow Patch Tuesday release process
3. • Create an announcement (example: Windows Server, version 1909)