Changed use of SystemException to InvalidOperationException to avoid code analysis warnings

src/Samples/CSharp/Analyzers/CSharpAnalyzers/CSharpAnalyzers.Test/Helpers/DiagnosticVerifier.Helper.cs

@@ -122,7 +122,7 @@ private static Document[] GetDocuments(string[] sources, string language, ParseO
 
             if (sources.Length != documents.Length)
             {
-                throw new SystemException("Amount of sources did not match amount of Documents created");
+                throw new InvalidOperationException("Amount of sources did not match amount of Documents created");
             }
 
             return documents;

src/Setup/Templates/CSharp/Diagnostic/Test/DiagnosticVerifier.Helper.cs

@@ -116,7 +116,7 @@ private static Document[] GetDocuments(string[] sources, string language)
 
             if (sources.Length != documents.Length)
             {
-                throw new SystemException("Amount of sources did not match amount of Documents created");
+                throw new InvalidOperationException("Amount of sources did not match amount of Documents created");
             }
 
             return documents;