Disable VSTHRD010 to improve build performance

We are not currently using this analyzer to its full extent since it
requires repository-specific configuration which is not yet provided for
Roslyn. Issue dotnet#29275 tracks configuring and enabling this analyzer.

build/Rulesets/Roslyn_BuildRules.ruleset

@@ -162,6 +162,7 @@ collection.
   <Rules AnalyzerId="Microsoft.VisualStudio.Threading.Analyzers" RuleNamespace="Microsoft.VisualStudio.Threading.Analyzers">
     <Rule Id="VSTHRD002" Action="None" /> <!-- Avoid problematic synchronous waits -->
     <Rule Id="VSTHRD103" Action="None" /> <!-- Call async methods when in an async method -->
+    <Rule Id="VSTHRD010" Action="None" /> <!-- Invoke single-threaded types on Main thread https://github.com/dotnet/roslyn/issues/29275 -->
     <Rule Id="VSTHRD110" Action="None" /> <!-- Observe result of async calls -->
     <Rule Id="VSTHRD200" Action="None" /> <!-- Use "Async" suffix for async methods -->
   </Rules>