Various fixes to aspire update#13364

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davidfowl wants to merge 3 commits intomainfrom

davidfowl/aspire-update-fixes

Commits on Dec 6, 2025

feat: Add new SDK migration messages and update project parsing logic
davidfowl
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Add unit tests for updating SDK version in csproj files
davidfowl
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refactor: Update ProjectUpdaterTests to remove AppHost references and adjust package assertions
davidfowl
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