Document .NET 11 SDK local container runtime selection change

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.NET 11 SDK container publishing now prefers platform-native local runtimes when available: wslc on Windows and Apple's container CLI on macOS. This can change which local runtime receives a published image when Docker or Podman is also installed.

• Breaking-change article

  • Adds a .NET 11 SDK compatibility article for the new local runtime auto-detection behavior.
  • Documents previous behavior, new behavior, recommended action, and affected container constants.

• Compatibility navigation

  • Adds the article to the .NET 11 breaking changes index.
  • Adds the article to the compatibility TOC under SDK and MSBuild.

• Container publish reference

  • Updates LocalRegistry documentation with the new supported values and detection order.
  • Notes that Docker and Podman remain fallbacks.

Example explicit runtime selection:

dotnet publish /t:PublishContainer -p:LocalRegistry=Docker

• Fixes [Breaking change]: SDK container publishing prefers platform-native local runtimes #54761

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Internal previews

File	Preview link
docs/core/compatibility/11.md	docs/core/compatibility/11
docs/core/compatibility/sdk/11/native-local-container-runtimes.md	docs/core/compatibility/sdk/11/native-local-container-runtimes
docs/core/compatibility/toc.yml	docs/core/compatibility/toc
docs/core/containers/publish-configuration.md	docs/core/containers/publish-configuration

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