Fix coverage.config

Author: Youssef1313

dotnet/coverage.config

@@ -7,6 +7,7 @@
                 <!-- Don't forget "Attribute" at the end of the name -->
                 <Attribute>^System\.CodeDom\.Compiler\.GeneratedCodeAttribute$</Attribute>
                 <Attribute>^System\.Diagnostics\.CodeAnalysis\.ExcludeFromCodeCoverageAttribute$</Attribute>
+                <Attribute>^System\.Runtime\.CompilerServices\.CompilerGeneratedAttribute$</Attribute>
             </Exclude>
         </Attributes>
     </CodeCoverage>