Make CliFolderPathCalculator a static class.

The `CliFolderPathCalculator` class implements no interface and has no instance
fields.

This commit therefore makes it a static class.

src/dotnet/commands/dotnet-msbuild/MSBuildLogger.cs

@@ -14,7 +14,7 @@ namespace Microsoft.DotNet.Tools.MSBuild
     public sealed class MSBuildLogger : INodeLogger
     {
         private readonly IFirstTimeUseNoticeSentinel _sentinel =
-            new FirstTimeUseNoticeSentinel(new CliFolderPathCalculator());
+            new FirstTimeUseNoticeSentinel();
         private readonly ITelemetry _telemetry;
         private const string NewEventName = "msbuild";
         private const string TargetFrameworkTelemetryEventName = "targetframeworkeval";