C#: Fix warnings caught by new problem-matchers #99902
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The above PR integrated specialized problem matchers for our repo, serving as enhanced versions of the ones we were already using. One consequence of this addition was the .NET solutions started to produce warnings as well, so those specific matchers needed to be excluded so they wouldn't create noise on all Actions post-merge. This PR fixes the handful of remaining warnings throughout the C# codebase, allowing that exclusion to be removed so future C# errors/warnings will be caught by GitHub Actions