Downgrade SemanticKernel to 1.46.0 and fix OpenAI PackageReference typo

[aasimkhan30]

• Fix typo in VSCode connector csproj: ->
• Downgrade Microsoft.SemanticKernel from 1.71.0 to 1.46.0
• Align OpenAI to 2.2.0-beta.4 (pinned by SK 1.46.0)
• Align System.ClientModel to 1.5.1

Code Changes Checklist

• New or updated unit tests added
• All existing tests pass (dotnet test)
• Code follows contributing guidelines
• Logging/telemetry updated if relevant
• No protocol or behavioral regressions

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[github-actions]

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