Add .NET 10 Alpha images to nightly repos

[lbussell]

Checklist:

• Create new images
  • Add entries for the new .NET versions in manifest.versions.json
  • Add new images for the new .NET version in each repo in manifest.json
    • Move latest tags to the new .NET version
    • Floating tags should have a -preview suffix. For example: 9.0-preview.
    • For fixed tags, the -alpha.1 suffixes that is part of the .NET version sufficient and no additional suffix is necessary
  • Adjust existing templates or add new templates in eng/dockerfile-templates/ if necessary
  • If there are no major changes between .NET versions, the new images can share runtime-deps layers with the previous .NET version
  • Include only the latest/LTS version of each operating system according to our supported operating systems documentation.
    • If adding a new OS version, follow the guidelines in new-distro-release.md
  • If PowerShell is not yet supported or functional on the new .NET version, file an issue at PowerShell/PowerShell or link to an existing issue, exclude PowerShell from the new SDK images, and file an issue to re-enable PowerShell in .NET Docker images
• Update tests
  • Add new version info to ImageVersion.cs
  • Update the test data to include the new distro version
  • If various tests are not yet functional on the new .NET version, file issues on product team repos as necessary, disable the test with a link to the issue, and file an issue in the dotnet/dotnet-docker repo to re-enable the test
• Update readmes
  • Update the MCR tags metadata templates to include the new distro version
    • The new tags should be in a preview sub-table, like so:

      dotnet-docker/eng/mcr-tags-metadata-templates/aspnet-tags.yml

      Lines 1 to 3 in 8fc28db

      	$(McrTagsYmlRepo:aspnet)
      	$(McrTagsYmlTagGroup:8.0-bookworm-slim-amd64)
      	customSubTableTitle: .NET 8 Preview Tags

• Update image size baselines
  • Queue a build of the dotnet-docker-nightly pipeline
  • Inspect the image sizes by pulling the new images from the dotnetdocker ACR and update the baselines accordingly