Update .NET 10 container breaking change doc to reflect final plans

[Copilot]

• Review the current content of default-images-use-ubuntu.md
• Remove -preview suffix from all container tags in the document
• Remove references to Debian Trixie images (as they won't be produced for .NET 10)
• Update the GitHub issue reference to The code in the table is not formatted correctly. #6526
• Add link to the announcement about container image platforms (discussions/6539)
• Update the "Recommended action" section to reflect that Debian images won't be available
• Verify all changes are accurate and consistent
• Add ai-usage frontmatter to comply with .NET documentation guidelines

Summary of Changes

Updated the breaking change document to reflect the updated plan for .NET 10 container images:

• Removed all -preview suffixes from Docker tags
• Removed references to Debian Trixie images (won't be produced for .NET 10)
• Updated GitHub issue reference from C18280: Incorrect link structure #5709 to The code in the table is not formatted correctly. #6526
• Added link to discussions/6539 about container image platforms at .NET 10's launch
• Removed recommendation to use Debian-specific tags since they won't be available
• Added ai-usage: ai-assisted frontmatter to indicate AI assistance per .NET documentation guidelines

Original prompt

On default-images-use-ubuntu.md, This breaking change document needs to be updated. The plan has changed from when it was originally written. We will not produce Debian Trixie images for .NET 10. This was proposed in dotnet/dotnet-docker#6526. Include a link to this announcement about the for container image platforms that we will ship at .NET 10's launch: dotnet/dotnet-docker#6539. Additionally, we can remove the -preview suffix from all of the tags in this breaking change doc.

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Internal previews

📄 File	🔗 Preview link
docs/core/compatibility/containers/10.0/default-images-use-ubuntu.md	docs/core/compatibility/containers/10.0/default-images-use-ubuntu

[Copilot]

Pull Request Overview

This PR updates the .NET 10 container breaking change documentation to reflect the final shipping plans, which differ from the original proposal. The key changes remove references to Debian Trixie images (which will not be produced) and update all Docker tags to use final release versions without -preview suffixes.

Key changes:

• Removed all references to Debian Trixie images since they will not be produced for .NET 10
• Updated Docker tag examples to use final release tags (10.0 instead of 10.0-preview)
• Updated GitHub issue references to reflect the final approved plan (#6526) and added launch announcement link (#6539)

[lbussell]

@gewarren please merge when appropriate.