[NET10.0] Annotate converters for nullability 4/n#29549

rmarinho merged 3 commits intodotnet:net10.0dotnet/maui:net10.0from

MartyIX:feature/2025-05-16-Convert-nullability-4-n-NET10MartyIX/maui:feature/2025-05-16-Convert-nullability-4-n-NET10Copy head branch name to clipboard