Fix syntax highlighting for optional parameters with ? prefix#19162

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Copilot wants to merge 11 commits intomainfrom

copilot/fix-fsharp-optional-parameter-highlighting

Commits on Dec 15, 2025

Commits on Dec 17, 2025

Fix Assert.NotEqual overload ambiguity by adding type annotations

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T-Gro
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Commits on Dec 18, 2025

Fix test to handle line-based range extraction and add detailed diagnostics

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T-Gro
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Commits on Dec 19, 2025

Fix test to use SourceText and RoslynHelpers for proper range extraction

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T-Gro
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