Try to exclude generated code

Author: stephentoub

.github/workflows/ci.yml

@@ -65,6 +65,7 @@ jobs:
         --blame-crash
         --results-directory testresults
         --collect "XPlat Code Coverage" -- RunConfiguration.CollectSourceInformation=true
+        --settings test.runsettings
 
     - name: Upload test results artifact
       if: always()

.github/workflows/test.runsettings

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<RunSettings>
+  <DataCollectionRunSettings>
+    <DataCollectors>
+      <DataCollector friendlyName="XPlat Code Coverage">
+        <Configuration>
+          <Exclude>
+            <Attribute>System.Runtime.CompilerServices.CompilerGeneratedAttribute</Attribute>
+            <Attribute>System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAttribute</Attribute>
+          </Exclude>
+        </Configuration>
+      </DataCollector>
+    </DataCollectors>
+  </DataCollectionRunSettings>
+</RunSettings>