Keep CLSCompliantAttribute in sync for src <-> ref (#66075)

ApiCompat actually ran validation for that attribute until the check was
disabled with a675e1c.

Enable it again and only disable it for baseline api compat validation,
which is performed in ApiCompat.proj.

eng/ApiCompatExcludeAttributes.txt

@@ -1,4 +1,3 @@
-T:System.CLSCompliantAttribute
 T:System.Diagnostics.CodeAnalysis.MemberNotNullAttribute
 T:System.Diagnostics.DebuggerGuidedStepThroughAttribute
 T:System.Runtime.CompilerServices.EagerStaticClassConstructionAttribute

src/libraries/System.Runtime.InteropServices/ref/System.Runtime.InteropServices.cs

@@ -1438,6 +1438,7 @@ public partial interface IConnectionPointContainer
         void EnumConnectionPoints(out System.Runtime.InteropServices.ComTypes.IEnumConnectionPoints ppEnum);
         void FindConnectionPoint(ref System.Guid riid, out System.Runtime.InteropServices.ComTypes.IConnectionPoint? ppCP);
     }
+    [System.CLSCompliantAttribute(false)]
     [System.Runtime.InteropServices.InterfaceTypeAttribute(System.Runtime.InteropServices.ComInterfaceType.InterfaceIsIUnknown)]
     public partial interface IDataObject
     {

src/libraries/apicompat/ApiCompatBaselineExcludedAttributes.txt

@@ -1,4 +1,5 @@
 // These attributes shouldn't be checked against baseline reference assemblies
 
+T:System.CLSCompliantAttribute
 T:System.ComponentModel.EditorBrowsableAttribute
 T:System.ObsoleteAttribute